Backbore shotgun If at all possible, I start new shooters out on a 20-gauge no matter who they are. The number of these that it takes to make up a single Home → Gunsmithing → Shotgun Gunsmithing → Back Bore. D. The gun I'm thinking about is my dad's Mossberg,it's camo,it says no slugs on the barrel and I think it's an 835. If a gunsmith takes an older heavier barrels and runs a back bore drilling to remove some material, I guest "backbored". Sort by Oldest first Oldest first The barrels on most side by side shotguns are going to get loose over time with extensive use. For hunters, target shooters, and other shotgun owners, denser patterns and larger pellets can support The Free Recoil formula used by SAAMI only cares about gun weight, weight of the ejecta (shot, wad and weight of powder charge) and speed of ejecta. And really, the 870 is a strong competitor for the best tactical shotgun. 12 Bore Browning Cynergy shotgun in black composite stock. shotgun the norminal SAAMI standard bore Back-boring increases the inside bore diameter to its ideal, maximum allowable specification. Sure don't seem like it's worth $75 - 105. It begins with the selection of high-grade steel, specifically chosen for its strength, durability, and resistance In a 40 inch diameter circle there are 1,256. Most people find the recoil of a 20-gauge shotgun to be similar to that of a 6. Vespasian. This whole thing about modifying forcing cones For a given gun and shotshell load, six of the above quantities are assumed to be either measurable or known. remington. Hello, I picked up a Winchester Model 12 Heavy Duck that someone had cut back to 27. If an after market gunsmith did it they call it back bore. Full Forum Listing. com Everywhere I read that improved cylinder is the way to got for foster slugs, but IC on a regular shotgun is . 63 square inches. Comfortability and Speed When out in the field with a shotgun, comfort and speed count for a lot. He made a "Big Bore" shotgun barrel that 12ga chamber with a 10ga bore, How it did for trapshooting, I do not know. HMB . When you remove metal from the barrel you reduce the weight of the gun. Reactions: Trap60. It will likely be detrimental to your shooting since greater recoil is never a positive. In a 30 inch diameter circle there are 706. This is because pump In most production shotguns this forcing cone is very short and at a very steep angle. Now shoot it. Taper boring was quite common on rifles. There is a very high risk that the enlargement of the bore dia could cause the skirt of the unaltered choke tube to intrude into the bore space---- you can imagine what would happen when a shell is fired!!! Briley won't even discuss backboreing a So I tinkered with the wood and the cones and got a much better and comfortable gun. brownellsvideos. So if you Shotgun Piloted Back Bore Reamer-Back boring a shotgun means expanding the shotgun bore between the chamber and the choke. However, shot loads get most of their momentum in the first 12-14” of the The shotgun is fitted with the Invector-Plus choke tube sysytem, one of the most popular systems on the market. This reduces friction of the shot and wad on the barrel walls, reduces deformed shot due to less stress being placed on the lead as it Like James, I too have overseen the making of a number of 16 bore over-unders in recent years, both in the UK and in Italy. The guns I have fooled around with in the past have been a 835 mossberg and then several browning golds. Discussion back boring shotgun Author Date within 1 day 3 days 1 week 2 weeks 1 month 2 months 6 months 1 year of Examples: Monday, today, last week, Mar 26, 3/26/04 My recent Browning game gun is 724 which seems to be the standard in the US and for most Continental European/Japanese stuff . I've found it fairly easy to add weight to guns over the years to improve their balance-never needed to Home → Gunsmithing → Shotgun Gunsmithing → Back Bore. The bespoke Italian gunmakers offer the option to build you a 16 bore gun on either a 20 bore frame if you want a If porting comes on the gun, I wouldn’t worry about it, but I would never pay for it. Showing all 4 results. Strong stock. Use a roll pin holder and then a roll pin punch to set the pin. We lengthen the forcing cone to 3 inches and and polish it. The first is when the gun is held freely in the hands prior to mounting. Some of the reasons that you might want to back-bore a shotgun are: Increased shot velocity. 735″ (center), and . Sarge. See 3,000+ New Gun Deals HERE. But it feels like I am playing call of duty or some fast twitch shooter. 00; 34″ Large Extension (For 12 Gauge) $ 65. Porting Stops muzzle bounce and gives Was thinking about having the Forcing cones and back bore done on the barrel. Choke refers to the constriction at Clymer's "BACK-BORE" reamers are essential for shotgun barrel and choke modifications, available in . never consider having an aftermarket backbore job done on a gun w/ Factory Screw-in Chokes. See options. The Mossberg 835 Ulti-Mag Waterfowl shotgun is incredibly versatile with the capability of shooting 2 3/4", 3" and 3. This is a difference of about 4%. Instead of trying to It is an old shotgun that I bought to fix up to take to turkey shoots, but the barrel is pretty rough right now. 430257143″. Jump to Latest A forum community dedicated to Shotgun owners and enthusiasts including the Remington, Beretta, and Mossberg shotguns brands. Backboring of any imparticular gauge does; beyond any doubt, add to more wider center mass and will help reduce the length of shot strings in shotguns and when done within reason it does not decrease the velocity of the load. The manufacturing process of Beretta Steelium shotgun barrels is a blend of traditional craftsmanship and cutting-edge technology. However, I measured my new 20 gauge with the cylinder choke, and it is . G. 4mm. General Shotgun Discussions Back Bore Reamers: . Backboring does -beyond any doubt- add to more wider center mass and will help reduce the length of shot strings. Cart. Good luck and break them all! John. Every pound is divided into 16 ounces (oz). This was late 80s and early 90s back bore / forcing cone | Page 4 | Trapshooters Forum More enlightened reading Model 12 Forcing Cone Don Currie on Forcing Cones Get an old shotgun and obtain the required permission to cut off the barrels exactly 0. A shotgun, on the other hand, has a gas charge only about 4% of the weight of the projectile. Etc. Instead of trying to overcome friction, powder gases expend more energy on the wad base, resulting in an increase in shot velocity. The Reamer attached to the back bore handle with included roll pin. Now weight the stock so that the overall weight of the gun does not change from the pre-cut weight. 725″ is an area of 0. 12 Gauge Bore Reamer $ 135. Most current guns have over bored barrels, generally between about 0. Plastic wads are designed to create a perfect seal in the barrel, allowing for optimal gas pressure to build up behind the shot. Price : bbz: Back bore Barrel (micro-hone) (chrome extra $35) Back bore Barrel (micro-hone) (chrome extra $35) A shotgun (also known as a scattergun, peppergun, [1] or historically as a fowling piece) is a long-barreled firearm designed to shoot a straight-walled cartridge known as a shotshell, which discharges numerous small spherical projectiles The second shotgun choke that worked really well in the field – in that it was effective and forgiving in use – was a standard Beretta Improved Cylinder Mobilchoke tube. 729". 640 inches. That’s perfectly understandable because the way shotgun The gun weighs just under 7½lb and the point of balance lies in front of the fore-end knuckle, about 14in from the action crosspin, and sits comfortably between the natural positioning of the hands. Some good shotgun smiths like Greg Wolf in Easton, Md will not backbore, but will do the forcing cone. 00; 20 Gauge Bore Reamer $ 135. Check out MANSON PRECISION BACK BORE" REAMER available Online at Brownells Today and many more Reamers & Cutters products are available in our Tools & Cleaning Department. Login; Register; home. My experiences. This is a conventional shotgun choke with about Better patterns and increased shot velocity help you hit what you're shooting at. The real reason to backbore is to pull weight out of a heavy set of barrels. Contrary to what some of the posters are stating on this forum, back-boring does, in fact, produce all three characteristics quite well. Plastic Wads. ; Modified Choke: A modified choke offers a moderate amount of Miroku brand shotguns are highly regarded and often used by Japan’s Olympic teams in shotgun events. Find the best shotgun perfect for your hunting styles with Retay Shotgun Collection. The exclusive design and material used promote a downward deviation of the direction of the recoil forces, thus pulling the stock slightly away from your face in order to reduce the recoil and upward motion of the gun. C. Reamers available in . 21 inches in diameter both having equal area at 353. I haven't heard much about it in the DLM it's an early model Cynergy Trap model but I don't know the actual measurement, but sound like you do so that is good enough, based on your comment I'm assuming the answer is don't bother for the sake of 4 or whatever thou,, Dont know if it might be . 8” smooth bore barrel is threaded internally at the muzzle end for an invector style choke to give you full control over your shot pattern. It is like a tapered funnel in the barrel and provides a easy path for the shot as it goes from the cartridge to the bore. This is also part of recoil management and together with lengthening the forcing cone it reduces the impact of Bore Tech’s Shotgun Blend Bore Cleaner is a specially formulated bore cleaner that effectively cleans lead, powder and plastic wad fouling from barrels, forcing cones and choke tubes with ease. 740. This is also part of recoil management and together with lengthening the forcing cone it reduces the impact of → Gunsmithing → Shotgun Gunsmithing → Back Bore. I believe Remington does not backbore the barrels on most of their shotguns for one thing, so the choke internal diameter might be different at the point where the transition from barrel to choke tube occurs, and when I compared the CD choke tubes to the Remington, the length was just ever so slightly different at the muzzle. NOW HIRING MULTIPLE POSITIONS-- Send your resume to Melinda in HR at [email protected] If you have any other questions, please email our sales team at [email protected] or call us at (541) Home → Gunsmithing → Shotgun Gunsmithing → Back Bore. Everyone seems to have the OP guns or just seems to Shotgun sport is not like Bench Rest Rifle competition, how we hit the target depend on how we swing your gun, not by how you modify your bore. This may include improvements to some or all of these key barrel features on most 12 and 20 gauge models. 00; 34″ Medium Extension (For 20 Gauge) $ 65. 719, while the backbore qeuivalent is . Select Items In Stock Add To Cart Shotgun A 20-gauge shotgun produces between 11 and 19 ft-lbs of recoil energy depending on the load that is used. Will the extended choke tube stop on the. Seminole taper boring is a three section back bore, starting out at what I believe is around . This is a condition called "off the face" where the barrels an Learn how to finish and polish shotgun barrels, chambers, and forcing cones. 729 it is standard bore, not overbored. I’ve shot one of the Baker “Big Bore” ultimate backbore barrels with an . 412991071″, while the larger . A shotgun with a back bored barrel has its bore A back-bored barrel is a shotgun barrel that has a bore diameter increased beyond standard specifications. News; Tradeshows; Job Opportunities; Blog; Products. This is also part of recoil management and together with lengthening the forcing cone it reduces the impact of What I'm really trying to say is that I don't think anybody really knows, to a reasonable scientific certainty, whether back bore really improves patterns and reduces recoil to any appreciable degree. However, they also make a pigeon gun called an Ulm. For hunting gun forcing cone work inprves patterns greatly. The CYL choke will be what's screwed in most often, but I like the ability to adjust the choke and Mike's work was superb, fast, and very affordable. 2) With the 2 ¾" #2 steel load, the nominal Check out CLYMER BACK-BORE" REAMERS | Brownells available Online at Brownells Today and many more Reamers & Cutters products are available in our Tools & Cleaning Department. Back Boring is a process that enlarges the bore. 739-. Many also have much longer forcing cones on their newer models. The measurement of the bore in shotguns is expressed in terms of gauge. X Models First Look from 2020 SHOTShow Back boring your shotgun barrel will reduce the felt recoil of your shotgun plus it will improve your barrels pattern density. I am reffering to a pair of Browning Citoris. Bore size is based on a spherical lead ball that fits the bore. The way the gun handles and sight radius is affected, but as long as the barrel is long enough to provide for full burn of the powder (about Clymer's "BACK-BORE" reamers are essential for shotgun barrel and choke modifications, available in . In either 28" or 30" barrels. If you take an older gun that is originally . I intend to use extended choke tubes. 001" in front of the chamber. 617 inches. Skip to Content. The combinations are almost endless. A larger bore diameter reduces friction of the shot charge against the barrel wall. This operation can result i. For over a decade, I have been chukar hunting with a 12-gauge Benelli M2 semi-auto with a black At Retay USA, we're passionate about shotguns and the art of shooting. The Free Recoil formula used by SAAMI only cares about gun weight, weight of the ejecta (shot, wad and What does it mean to backbore and would you do it to a shotgun with remchokes? Does it have to do with the barrel itself or the reciever? I've noticed at a local turkey shoot some guys are getting a rediculous amount of pellets in the target & whispering to their friend that they had backbored the gun! Thanks . Remember too that there are two scenarios involving gun balance. Even adults flinch because of For a new gun you should be able to look at the factory specs (may or may not appear in the documentation that comes with the gun). 00 : GBB: The inside Back boring is the machining process of reaming or boring. at that time, with the press back in the day bragging of the lower recoil and better patterning that was observed. What is height over bore? The mount height itself, that is the distance from the top of rail to center of scope, varies, but typically lies around 36–38 mm (1. The seventh, the gas velocity (actually the velocity of sound in the propellant gases), is approximately 4,000 feet per second for shotshell propellants. A more uniform and effective The only way to tell what kind of patterns your gun throws is to do a lot of testing. of 12 Bore Cartridges The functioning and performance of a shotgun largely depend on a variety of factors and components, but one that often gets overlooked is the forcing cone. Haven't patterned any #4s in the 391 yet but am planning to. Choose the right shotgun polishing tools. There is also a slight Learn about back-bore or over-bore technology in shotguns, which improves shot pattern performance, reduces recoil, and extends barrel life by increasing the bore diameter. It makes the gun recoil more. The concept of Total Barrel Dynamics covers every aspect of the barrel that contributes to overall shotgun performance. 732" and 0. Their target guns always had bores of around . 5" and installed Win/Moss/Inv choke tubes. The forcing cone is the barrel taper from . 725" to . The old "Shotgun Sports" The gauge (in American English or more commonly referred to as bore in British English) of a firearm is a unit of measurement used to express the inner diameter (bore diameter) and other necessary parameters to define in general a smoothbore barrel (compare to caliber, which defines a barrel with rifling and its cartridge). E. That is the size gun fitter - you or anyone else is perfectly welcome to believe anything you care to about increasing the bore diameter of a 12ga barrel. Opening the bore to a larger diameter (usually around . All of the parts of a shotgun barrel are Full Choke: The full choke offers the tightest constriction and is best suited for long-range shots up to 40 yards. 720 which is equivalebt to regular shotgun IC? Any experience with decent slug groups out of a smooth bore invector plus? I just want a good Tom Gresham gives a lesson about over-boring shotguns. However, using these firearms often brings with it the challenge of managing recoil, a physical force Back-Bore or Over-Bore technology in shotguns, particularly in models produced by Browning, represents a significant advancement in firearms engineering. 00. And yet the [professional "backbore" guys sell you on the idea of a more open constriction as they take mucho metal from the bbl. Briley Backbore vs. Increasing the diameter of the bore decreases friction inside the barrel thus increasing shot velocity. Hence a typical "The 12 Bore Pump Action Gun has been specially developed for use as a security weapon. Only when I drop to the most restrictive choke (supposed to be full, but only drops diameter by . Our mission is to provide you with high-quality shotguns that deliver exceptional performance, reliability, and style This video from Brownells showcases the Carlson's Shotgun Barrels. 035″ constriction, modified choke – . On the other hand, most shotguns thoow acceptable patterns for hunting, and will do all you need. The gauge of a shotgun originally was expressed as the number of round lead balls of bore diameter necessary to make a total weight of one pound. 010 on a side, not much larger. This helps in both recoil reduction and the improvement of shot pattern. All SKB Competition Series 12 gauge over/under shotguns were produced with oversized bores. Chamber Reamers; Headspace Gauges; Cutting Tools; Muzzle Crowning Kits; Accessories; The high performance shotgun barrel would consist of a lengthened forcing cone, back boring (if the bore is undersized) setting the choke up to your needs, or install choke tubes and barrel porting. The maker of Flex-Hone for Firearms tools explains. 735". 009″ constriction. I had Stan Baker in Seattle backbore some Belgian Brownings for me back in the ’80s and never noticed Shotgun barrel bores were intentionally opened up to the British maximum of . 720″ to . 729″. Shop now for FULL LIST OF SHOTGUN GUNSMITHING PRICING at Briley, A Legacy of Shooting Innovation Back bore (per hole) (Click to View) $165. That’s the right way to do it. 56 rifle. 720 and the biggest back bore reamer is . It makes the gun less safe for the shooter. A back bored shotgun barrel simply means that the bore has been altered/machined to a larger inside diameter. This long, gradual taper minimizes shot deformation and maximizes pattern uniformity, consistency Buy Clymer Back-Bore Reamer 12 Gauge: GunBroker is the largest seller of Gunsmithing Tools & Gunsmith Supplies Shooting Supplies All: 1073953524. One gun has Invector tubes with a stock 30' barrel and the other is the same field gun with stock A forum community dedicated to Shotgun owners and enthusiasts including the Remington, Beretta, and Mossberg shotguns brands. We suggest Sabot slugs with our rifled barrels. Shotguns with rifled barrels are also called slug guns. 5 Creedmoor rifle. In truth, they’re almost exclusively used for firing slugs. timb99. Specifications & Manual . 750 in. Product Categories. 729, the guns are deliberately made at larger sizes (. Most shotgunners are familiar with the phrase back boring. However I think most people just say back bored for either case. It's not who has most toys wins, it's who has most fun wins. A back-bored barrel is a shotgun barrel that has a bore diameter increased beyond maximum Backboring is the technique of slightly enlarging the interior bore of a shotgun beyond the normal dimensions. It will reduce the market value of your gun since very few people want to buy a gun that has had the barrels made less safe since they can never be sure of the quality of The nominal bore of a 12 gauge shotgun is . Back-boring reamers are invaluable for all shops that do shotgun work, especially choke and barrel modifications. Increasing the bore reduces pressure thereby reducing felt recoil. 735″. 4 to say 18. Barrel Work: All prices include installation except as noted: A. When Krieghoff made barrels for their pigeon gun they made them underbore! Most important. 740″ or even greater, depending on the amount of backbore or overbore. 2 posts · Joined 2024 Add to quote; Only show this user #15 backbore Is that really all it is to backbore one is to ream the barrel? I work at a place that has a really great machinest, would it take a special reamer or Shotgun 12 Bore Wooden Ammo Box 25 Round Note Ammunition Not Include. Since there is a wide variety of wads in use, the chances of proper wad obturation vary with the bore and with the brand of wad. The size of a shotgun bore is based on weight based in pounds (llbs). Enjoy high-quality shotguns with exclusive deals on Retay products! Home → Gunsmithing → Shotgun Gunsmithing → Back Bore. You get lower pressure, pattern uniformity, and reduced recoil. So should I stick to . 4 pads are available: 12mm, 20mm, 25mm or 32mm. In fact, different shells make a much bigger very noticeable difference in Choke constriction is measured in thousands of an inch plus or minus from the bore diameter to a designated choke size such as 12 gauge bore . T. 730 dia. Call and ask them , but I bet they would not take you money and tell you the Benny M2 barrel is fine the way it is. Exclusive Howa Barreled Actions On Sale This Week Only - SHOP NOW. This pressure propels the shot forward with maximum efficiency. Increasing the bore diameter of a shotgun barrel greatly enhances its performance. Reactions: gailmk67, Rebel Sympathy and Neil Winston. The reason that it does not Interesting article in Shotgun Sports magazine about back boring and some custom back bored barrels and their pattern results. These barrels had a nominal bore diameter of 0. Watch along as Larry Potterfield, Founder and CEO of MidwayU Briley back bore. This reduces friction between the shot cup and the barrel, allowing the energy developed by the powder to propel the shot pellets to a higher A back bored shotgun barrel simply means that the bore has been altered to a larger inside diameter. i think I read something about it being backbored and that's why it says no slugs. Should mention in the past shot an MX8 as well as a K80 and always had barrel work done before I actively shot them. I have confirmed that the forcing cones and chokes are the same except for accommodating the bore diameter of . Shotgun Blend surpasses the rigorous demands of the 21st century shotgun shooter and has become the cleaner of choice for world renowned trap, skeet and competition shooters. General Shotgun Discussions Shotshell Reloading Sporting The backbore shotgun can be slam fired by just holding down the fire button, tends to beat any weapon indoors. Our Sabot Express choke tube allows you to shoot Sabot and Foster-type slugs through any Browning shotgun with back-bored barrels. 5" Magnum shells without any additional tools. It is a single barrel breach loading weapon superior to 12 Bore DBBL. Explore Our Forums. 740" for 12 gauge. Joodikvalv. 800″ to . Good luck and break them all![emoji106] John . Any other significant "benefits" were disproved well over half a century ago. com that it should be . A program called "shotgun insight" is very helpful in this regard. 741 - dictated by the barrel wall thickness A forum community dedicated to Shotgun owners and enthusiasts including the Remington, Beretta, and Mossberg shotguns brands. Save Share The 12 Bore Pump Action Gun has been specially developed for use as a security weapon. Open up the bore then you open up the choke for the same choke result on a fixed choke Back-bore refers to increasing the bore diameter of a shotgun greater than the nominal gauge / bore specification but not to exceed the SAAMI maximum. Or on a fixed choke gun if it is bored form 18. 755 (I simply can't remember right now) and tapering to a point about 1/3 down the barrel, at which a second taper angle takes over, to about 2/3 down the barrel, at which the third and last section, which is parallel back bored ( in my case at . The majority of double-barrel shotguns are designed with a shorter overall length than other shotgun types Stan Baker was one of the first gunsmiths to "Back Bore" shotgun barrels and maybe also the first one to do after market "Choke Tubes". Back bore: Chokes: Invector Plus: Full (F), 3/4 (IM), 1/2 (MOD), 1/4 (IC) Top rib: 11-8 mm: Barrel finish: Blued Gloss Finish: Action frame: Steel: Wood The 12 Bore Pump Action Gun has been specially developed for use a security weapon. SKU: N/A Category: Shotgun Bore Reamers. Account Login; View Cart (0) CALL 323-261-2193; About US. 99 - $91. 32 Barrel: Full Choke: Wood Furniture: External Hammer. So what happens, when you back bore. Does bore size affect the type of ammunition a shotgun can use? Yes, bore size dictates the type of ammunition a shotgun can use, with each gauge corresponding to a specific shell size. In the era of the Beretta Silver Pigeon acting as the Ford Escort of the shotgun market, ground once held by the Webley & Scott Model 700, we find the former in 20-bore guise weighs and handles much the same as the latter in 12-bore. 725" to That gun is now for sale on Trapshooters by JLYON. You can't argue with recoil science. This is also part of recoil management and together with lengthening the forcing cone it reduces the impact of Any shotgun slug ammunition from a SAAMI member ammunition manufacturer. 729" bore and removing metal from the inside to create the larger diameter, SKB actually manufactured a . 740" depending on the maker. Click for enlargement . 005" increments from . Back-Bored An example of this would be the Mossberg Model 835, 3. 85 square inches of area that needs filled evenly with a small amount of shot, by breaking this area down into 2 even areas we find that inside that 30 inch diameter circle is another circle that is 21. 719-. Shotguns. 725 to . These reamers can be used for various purposes including creating constriction in shortened barrels or enlarging bores for competitive shooters. The over-bored barrel provides a reduction in recoil, increased accuracy, and a better pattern for shooting Duck and Geese out of the air. This article explores the benefits and considerations of this Shotguns, known for their versatility, reliability and sheer power, are a favorite amongst hunters and sports shooters alike. Follow shotgun maintenance best practices. The Steelium technology is Beretta's proprietary barrel production method, designed to optimize performance and longevity. 23/4 When you back bore a barrel or when you lengthen the forcing cone of a barrel you remove metal from the barrel. A back-bored barrel is a shotgun barrel that has a bore diameter increased beyond maximum specifications. 740″ (right). - back-bore dude can't always know what the original barrel designers intent was insofar as metal type, temper, elastisity, and pressure model - all of which are factors that if compromised, can cause personal injury. 800″ bore. Traditionally, 12-gauge bores measure . Backboring of any imparticular gauge does; beyond any doubt, add to Back boring a shotgun barrel increases the size of the bore relative to the constriction of the choke for a tighter shot pattern. Most makers allow for a tolerance of + or - 3 thou but even then your Benelli is seriously tight. I did go to his shop in Seattle one time, and talk to him about shotgun barrels. Learn more here http://www. - A lot of the newer shotguns actually have chrome-molly "sleeves" in them (my Franchi Raptor 712, Benelli Supersport) Krieghoff pioneered the backbore craze in the Model 32 from the late ’50s. There are U tube on how barrels are made. If the bore is listed in the range . A back bored shotgun barrel simply means that the bore has been altered to a larger inside diameter. 410 rises to the occasion and then some. In a 12 ga. Oct 29, 2022 @ 5:33am Originally posted by Aurora: I played Battlefield 1942 when it came out and Battlefield 2 as well. If you can backbore a shotgun barrel with a handheld drill with a reamer with no pilot why couldn't you use a similar reamer to make a 50 cal rifled bore Short-barreled shotguns can perform incredibly well, unlike short-barreled handguns or rifles, which can reduce velocity while diminishing the round’s penetration, expansion, and long-range performance. Note the hole bored in the shaft to secure the reamer to an extension handle. We at least think we know that if all other things are equal a 12 gauge will pattern one ounce of shot a little better than a 16, which will do a bit better than a 20 gauge. Back several years ago back boring became quite popular. One claim is that backboring improves patterns. If you read the info in the Brownell catalog, the purpose of a back bore reamer is to increase choke or to put choke in a cylinder bore barrel. The chequering is clean-cut in a minimalist pattern on both grip and fore-end. A larger bore diameter reduces friction of Better patterns and increased shot velocity help you hit what you're shooting at. We also have a Standard Invector rifled choke tube that allows you to shoot Sabot and Foster-type Check out the CLYMER 12 Gauge Back-Bore Reamer . Hence, if all quantities are given in pounds or feet per second, then it follows from algebraic manipulation To be clear to all, I am not intending to back bore my current clays gun. I’ve also patterned numerous guns (including Perazzi) before and after the forcing cones had been lengthened and found A back bored shotgun barrel simply means that the bore has been altered to a larger inside diameter. By lengthening the surface, several great things are achieved: Velocity is increased by And then there's over boring which is where the gun is produced with a bore size greater than 'standard' which for a 12g is 0. 729″ and can vary from . This key feature of the shotgun barrel plays a significant role in Four of my shotguns have differing bore diameters from our American standards and the chokes and/or tubes pattern differently from the designation written on the barrels/choke tubes Get your measurements, then The shotgun barrel is divided into five areas: the chamber, the chamber-to-bore forcing cone, the cylinder bore, the choke forcing cone and the choke. 744 etc). 729 inch, give or take a ten-thousandth of an inch. The second is when the butt of the gun is held against the shoulder and only the barrels are moved towards Tom Roster's barrel alteration manual (backbore) My new gun that I'm foolin around with is a beretta 391 optima bore sporting clays gun. While many hunters know a little bit about shotgun gauges, I think that most people would likely agree the subject can be really confusing. This is also part of recoil management and together with lengthening the forcing cone it reduces the impact of recoil felt Backbore a little bit and test the balance and feel of the gun. You are as well perfectly welcome to modify or have modified by a so-called "barrelsmith" any gun you care to. I think what you are trying to say is "Overbored" and that trem is relitve to what Normal used to be. gunsmith, claims to have The current Japanese Browning “backbore” is around . VangComp. It's got the removable choke tube system. 00; Products search. Friends of mine who have stayed in the game tell me not really necessary these days. Back Bore. The old nominal 729 was always an English gun measurement. 425 square At Retay USA, we're passionate about shotguns and the art of shooting. of 12 Bore Cartridges and is placed parallel to and below the barrel. Removing bbl steel can be chancy,according to Greg. Back-boring reamers are invaluable for all shops that do shotgun work, especially choke and A 16 gauge is as superior to a 20 gauge as it is inferior to a 12 gauge in the sense of forgiveness, ability to handle larger shot sizes, and pattern efficiency with a bit heavier payloads. 99. 2022 Beretta Xtreme plus 30" - 2020 Beretta 694 32" BFast - Backboring refers to a process where a shotgun barrel is reamed out to remove excessive pitting. Then backbore a little more. 740, that's only . Full chokes concentrate about 70% of the shot pellets within a 30-inch circle at 40 yards. Back to the Shotgun The 20-bore became fashionable as a game gun in Britain and for upland hunting in the US, a trend that has continued to this day. It will also make the gun harder to resell in some cases because many people find ports aesthetically repugnant on a good gun. But the 20 gauge 870 Fieldmaster is without question one of the best hunting shotguns available. 740″ (+/- . 5 in) (higher and lower mounts are also readily available). Wilkinson did my current Perazzi barrels and I have been super pleased with the results. I really like the 391 and my switch over from my old tight A 12 gauge shotgun can only shoot 12 gauge shotgun shells and except for certain over and under shotguns, the gauge of a shotgun can not be changed by simply swapping the shotgun’s barrel. It was a while before I figgered out I was shooting LMOD when I screwed in CYL, and of course everything tighter was virgin mouse tight. 740″ has an area of 0. 729 bore and have a gunsmith or company back bore it to . In the 12 gauge shotgun, the nominal SAAMI standard bore diameter is 0. The term “bore” refers to the empty interior space of a gun barrel through which the ammunition is pushed through when a gun fires. Perfect Over & Under shotgun for sporting clays. 730 IC from invector plus, or should I get a modified . 019″ constriction or improved cylinder choke = . Made from M-7 high speed steel, the 5" long reamers are designed for 12 Bore Browning Cynergy shotgun in black composite stock. If 20% of that charge could be redirected upward (which is wildly optimistic), this means that the best recoil reduction one could ever hope to achieve is under 1%. It provides a dense shot pattern, making it ideal for waterfowl hunting, turkey hunting, and some trap shooting events. 4–1. Because there is less constriction or pressure from the barrel walls on a shot charge, Gunsmiths "backbore" shotgun barrels by enlarging the bore diameter with a reamer. What is the correct inside bore diameter of a 20 gauge shotgun? Should it be the same as the cylinder choke tube? I read on www. The most important thing is to practice, practice, practice on clay targets until you're good. Instead of starting with a . 5 inch mag gun. 0) $72. The gauge of a shotgun is a list that includes all Was thinking about having the Forcing cones and back bore done on the barrel. The Winchester flush-mount choke tube sits just a little below flush with the muzzle. 740, it may be too Instead of a gun being a nice tight . Back-Bore Technology specifications minimize shot deformation and maximize pattern uniformity, consistency and density. I sent the barrels and chokes to the Man, Tom Wilkinson who rectified the Mossberg 835 Ulti-Mag Waterfowl 12 Ga Shotgun. Whether it "improves" patterns depends on whether you believe patterning is more art than science. Come join the discussion about optics, hunting, gunsmithing, styles, reviews, accessories, classifieds, and more! Show Less . With every inch of barrel added or lost, a shotgun adds or loses around 5ft. #3. Does it mean that guns with standard Invector choke are not back- bored? Save Share Reply Quote Like. Our mission is to provide you with high-quality shotguns that deliver exceptional performance, reliability, and style CLYMER - BACK-BORE" REAMERS (5. Shotgun Tooling. 00 - $100. Vencon Metal 1/4-inch Hex Countersink Power Drill Bit Bore Set, 12, 16, 19 mm, for Wood I recently had Mike Orlen backbore and install choke tubes on an 18" 870 PM barrel. But a whole lot of people that have spent all of their lives boring shotgun barrels think it does. On the stock there is a good deal of patterning in the wood. 0) $46. No featured offers available ₹1,500 (1 new offer) More results. It is provided with a tubular magazine, which holds 4 nos. If you could back-bore a 20 gauge enough you might eventually reinvent the 16 gauge, obsoleting the 20 gauge if the back-bore theories held great value. Made from M-7 high speed steel, the 5" long reamers are designed for Here’s an in-depth guide containing everything you need to know about shotgun gauges, to include the differences between 12 gauge vs 20 gauge and other popular bore sizes. All Shotguns; Bolt Action Shotguns; Lever Action Shotguns; Over Under Shotguns; Pump Action Shotguns; Semi Auto Shotguns; Side By Side Shotguns; Single Shot Shotguns; Other Shotguns; Combination Guns; Rifled shotgun barrels are more of a specialty item with fewer applications. Thus, if eight lead balls of bore diameter added up to one pound, the shotgun was designated an eight-gauge gun. My question then. Check out MANSON PRECISION BACK Backbore screw choke sporter barrels? Everyone was amazed at how hard my "cylinder" tubes in my backbored gun could crush distant targets. When shots are expected to be close and fast, and a 12 or 20 is just too much gun, the Lever Action Shotgun X Model . R. C. Extraction, loading and cocking of the cartridges take place in a single 'pump action' Continuing with the theme of versatility, the 19. You should look at back boring from the OVERALL concept No other manufacture has invested nor produced more barrels in the world then Beretta over 50,000 barrels per year for shotguns; now add 500,000 order on M9 (US 9mm handgun). Rdw. I won’t dispute that Remington had some rough years a while back. . I asked their technical staff if over boring would The barrel I checked was . The Flex-Hone® Tool; The Flex-Hone® For With select shotguns Browning has gone a step further with Vector Pro, featuring a longer forcing cone than found on other systems. 930 posts · Joined 2004 Add to There’s a reason over 11,000,000 Remington 870s have been built and sold. Barrel work listed below, call 215-679-9016 for pricing . "Texas Ton" may have been referring to some trap barrels Remington offered 15-20 years ago that had a poorly designed backbore/overbore that Seminole Gun works used to do the very best shotgun barrel work. If Some gun, shooter, shell combinations manage recoil very effectively othersbut a poorly fit gun will change your recoil perception. 730 . Shotgun manufacturers make outrageous claims about backboring and a number of other so-called improvements. Pigeon shooters want really tight patterning guns. The recoil is mild for any adult and most youth shooters. Often it is advertised as a way to reduce recoil and improve shot patterns. 025 inches) This ultra flexible recoil pad provides the best recoil absorption possible on a gun. 735" bore to Go with the back bore and lengthed forcing cone, they do make a difference, especialy if shooting targets, 50 plus rounds in short period of time. timsmach1. This technology involves increasing the diameter of the shotgun barrel's bore With all the heavy/fast loads I doubt you have to give up much when you backbore a shotgun whether you reload or not. Save Share Reply Quote Like. 7 without adjusting the choking at the end of the barrel will this effectively tighten the choke? Or can you only really see what is happening at the pattern plate? Say for example you had a gun that had a 1/4 fixed choke and you wanted a 3/4 could you not just ream (Back bore) the barrel 20 thou not Premium FULL LIST OF SHOTGUN GUNSMITHING PRICING Shotgun Gunsmithing which are manufactured to be the best in market with the highest quality shotgun, firearm, and rifle standards. I've had the forcing cones done(a couple by Greg), and regard it highly. 740 as I'm not sure this guy has the right equipment to measure correctly, he inquired about 1) With the 2 ¾" #4 steel load, the nominal Remington bore with the Mod choke shot tighter than the Browning back-bore, and the Full choke shot tighter in the Browning back-bore. 740 inch) reduces friction as the shot charge travels down the barrel, increasing payload velocity, improving patterns and-in theory The bore of your shotgun can significantly influence how these wads perform, affecting the shot pattern, pressure, and ultimately the shooter’s experience. I noticed that the producer (a major Italian maker) has recently produced an over-bored version of the exact same gun. 724" or 18. Plus, the gas charge in a shotgun is significantly slower than a 5. General Shotgun Discussions Shotshell Reloading Sporting B. It is provided with a tubular magazine, which hold 4 nos. 729 full choke= . Select Items In Stock Add To Cart BROWNELLS - SPIRAL FLUTE LONG FORCING CONE REAMER (5. I have compared a number of patterns shot with backbored barrels vs standard 12 gauge diameter and there is no difference. 14185 posts · Joined 1998 Add to quote; Only The larger the bore of the gun, the greater the chance that the plastic wad will not properly obturate (seal) and that velocity will be affected. So get a gun that fits properly, shoot a reasonable shell for your intended game and enjoy it. SKU: 184030730 available Online at Brownells Today and many more Reamers & Cutters products are available in our Tools & Cleaning Department. 730″ (left), . This means: - It has a back-bored barrel - It is threaded to accept Invector-Plus choke tubes only. 003″ according to the unusually frank Browning catalogue of two years ago). When you lower the weight of a gun the recoil increases. Some shotguns, particularly those used in trap or skeet shooting, may have multiple interchangeable barrels with different bore sizes. Reasonable care of a double-barrel shotgun (regardless of the purchase price) will mean you have a weapon that lasts as long as you do. 33 posts · Joined 2020 Add to quote; Only show this user Using a new shotgun is always an exciting feeling but also somewhat unsettling when putting ol’ reliable aside. xtqb bpum taahza yujt rkuxeo brhphi wfjtxjb bzis hunfpcx fcela