Shotgun Barrel Wall Thickness Gauge
Posted : admin On 27.10.2019The Shotgun Combo Gauge is an accurate and convenient device that measures all of the outside dimensions of your shotgun, which you need to know if you want your gun to fit properly:. Length of Pull. Drop at Comb and Heel. Angle of Pitch. CastThe Shotgun Combo Gauge is a 24″ vernier caliper slotted at one end to hold a sliding Drop Meter. It can be used alone or with our 23″ EXTENSION which bolts on to the Combo Gauge to make the overall drop/pitch length 48″. The Extension also has a neodymium magnet installed which essentially “glues” the whole Combo Gauge to the gun’s rib for hands-free operation, further enhancing its convenience and usability.99% of our customers purchase the Shotgun Combo Gauge with the Extension.One DROP METER is standard on the Shotgun Combo Gauge, but a second Drop Meter can be added as an option, which gives greater versatility in measuring drop (you can measure at any two points along the comb simultaneously), or drop and pitch, or drop and cast simultaneously.
Sep 04, 2007 First, on shotgun barrel(s) the thinnest barrel wall thicknes can be found at the muzzle. The Remingtom Md 32 comes to mind, that the thickness of the barrel walls on this gun, was about.060 or 60 thousandths at the muzzle. Most SxS's and O/Us with with fixed chokes will usually run in the neighbor hood of.060.080 for wall thickness at the. The 30” rolled steel barrel has little blue remaining but no dings or pits, with a very good bore that has moderate frosting but no real pitting at all. The bore diameter remains factory correct at.731 with a Modified choke and a minimum barrel wall thickness a very substantial 58 thousandths.
Magnetic Wall Thickness Gauge
SHOTGUN COMBO GAUGE FEATURES AND BENEFITS:. Reads both Metric and Inches for use worldwide. Has easy-to-read bold numbers. Lightweight — Made of aircraft aluminum.
Portable — Easy to travel with. Optional Extension with Magnet. The magnet “glues” Shotgun Combo Gauge to gun rib for hands-free operation. Optional Dual Drop MetersSPECS FOR BASIC GAUGE:. Length for drop measurement: 28″. Length of pull: 24″.
Wall Thickness Gauge Chart
Overall length: 29.5″SPECS WITH 23' EXTENSION:. Length for drop measurement: 48″. Overall length: 49.5″. Spring-loaded probes always exert equal pressure on the bore, making readings accurate and repeatable. LCD resolution: 0.001″/0.1″mm switchable inches/metric.
ID Measurement: Range-0.375″ to 1.200″. Depth to 6″.
Accuracy: +/-0.001″. Hardened steel construction. Brass probe beads: 0.040″ projection. 6″ probes graduated in inches and metric. Measure barrel wall thickness (BWT) with BWT device. Accuracy: +/0.002″. ABS scales always read true position.
Floating zero, relative measurements and absolute measurements. Automatic shut-off. Operates on a single type 357/SR-44 battery, 2 year life. Includes 0.725″ calibration ring and calibration strip 0.025″ for BWT measurement. Includes instructional DVD.
At a recent pheasant hunt, one shooter was using a magnificent Parker 12 gauge Frame 4. I routinely use the BoreMaster to measure older guns – for safety reasons as well as my own curiosity – and I discovered that this Parker had been drastically cleaned up inside; bore diameter after the chamber was 0.753″ and bore diameter 5″ in from the muzzle was 0.744″. Nominal 12 gauge bore size is 0.729″. The barrel wall thickness 5″ from the muzzle was 0.023″!Although the owner was shooting target loads successfully, I warned him against using heavy pheasant loads and suggested that he have the barrel wall thickness measured mid-barrel.The photo illustrates what a 1-1/4 oz.
Pheasant load did to the left barrel of this compromised gun.Luckily no person was injured. Although the owner ignored my advice, the BoreMaster did its job by indicating a potentially dangerous condition. If the owner had used the BoreMaster when buying the gun he probably would have wisely declined the purchase. We have measured hundreds of shotgun barrels and have now developed anecdotal results that we want to share with you.Remember, when measuring with the BoreMaster, you CANNOT push into a measurement – you must insert the probes beyond the measuring point, then WITHDRAW the BoreMaster, allowing the spring pressure to do the measuring without interference from your hand.1. Shotgun bore diameters are all over the place, varying as much as 2% of nominal diameter.
An example of this is an underbored Perazzi 28 gauge measuring.537/.538 (nominal is.550), a Browning Double Auto made around 1957 at.720 and a 1964 Browning Superposed 20 gauge at 0.625 (overbored). The question is how does one confirm that the BoreMaster is reading accurately?
The method we use to verify the bore measurement is by measuring the CHAMBER dimensions. The chambers are typically held to a very tight spec which we measure to the thousands. Chamber dimensions are provided with the BoreMaster Instructions.2. BARREL WALL THICKNESS can be accurately measured 6″ into the bore. (OPTIONAL KIT REQUIRED)3. RIFLE BARREL CHAMBERS can be accurately measured. Calibers with case diameters over.400″ – that includes the 30/30 and 30-06 variations — and metrics like the 8 mm and 7 mm Mauser and larger can be measured.
Obviously the barrels have to be removed from bolt or lever guns, but single shots and any break guns are readily measurable. This is an extremely fast and accurate method of verifying a gun’s chamber – especially unusual metric, Continental, British or obsolete American barrels. It also verifies if a chamber has been altered to a wildcat configuration.4. MEASURING TECHNIQUES. We have found that measuring a handheld or vertical gun is difficult, resulting in errors. Place the gun (barrels) horizontal on a table or countertop at rest and insert the BoreMaster probes keeping them parallel to the barrels. That technique will always result in accurate and repeatable readings.5.
MEASURING CHOKES — The BoreMaster as the “De-Liar.” The results obtained by measuring your fixed or screw-in chokes will surprise you. What one manufacturer calls Mod is another’s I.C. Buy screw-in chokes (12 ga) designated for steel shot and I.C.
May be 0.003″ Modified around 0.010″ and Full AT 0.018″. These are readings from a Perazzi Mirage with Briley thin wall chokes for steel shot. Those of you with Polychokes can now accurately find the TRUE choke constriction for each designation on the Polychoke. These numbers will both surprise and enlighten you and add to the usefulness of this great product.6. MEASURING CHAMBER LENGTHS.
When buying or evaluating British and Continental guns, chamber length is a critical factor in the gun’s value. An expensive side-by-side marked 2-1/2″ chamber length on the barrel flats may be worth its full value until you measure the chamber length with the BoreMaster and discover that during the gun’s life, someone lengthened the chambers without reproofing the gun. Now what is it worth? Have the forcing cones been altered?These aforementioned measuring jobs are accomplished accurately in a minute, not an hour.
Foremost, the BoreMaster brings accuracy, convenience, portability, ease of use and the capability to measure all gauges at an affordable price.
From left to right; a, a shotshell, a shotshell, and a 12 gauge shotshellTypePlace of originVariousThe gauge of a is a unit of measurement used to express the inner diameter (bore diameter) of the.Gauge is determined from the weight of a solid of that will fit the bore of the firearm and is expressed as the of the sphere's weight as a fraction of a, e.g., a one-twelfth pound lead ball fits a 12-gauge bore. Thus there are twelve 12-gauge balls per pound, etc. The term is related to the measurement of, which were also measured by the weight of their iron; an would fire an 8 lb (3.6 kg) ball.Gauge is commonly used today in reference to, though historically it was also used in large, which were made in sizes up to during their heyday in the 1880s, being originally loaded with black powder cartridges. These very large rifles, sometimes called ', were intended for use in Africa and Asia for hunting game.Gauge is abbreviated 'ga.' , 'ga', or 'G'. Left-to-right:.410, 28ga, 20ga, 12ga.The most common size is 12 gauge, with up to 50% of the overall shotgun market in the United States. The 20 gauge shotgun is favored by shooters uncomfortable with the weight and recoil of a 12 gauge gun, and is popular for.
The next most popular sizes are 28 gauge and.410 bore. The 10 gauge and 16 gauge, while a little less common, are still readily available in the United States.Shotguns and shells exceeding 10 gauge, such as the 8 and 4 gauge, are rather rarely manufactured and only a few makers of the otherwise large market of shotgun, rifle and ammo makers across the United States still produce them. Shells are usually black powder paper cartridges as opposed to the plastic or wax cartridge and smokeless powder of today.The 11, 15, 18, 2, and 3 gauge shells are rarest of all; owners of these types of rare shotguns will usually have their ammunition custom loaded by a specialist in rare and custom bores. The 14 gauge has not been loaded in the United States since the early 1900s, although the 2 9 / 16 inch hull is still made in France. The very small 24 and 32 gauges are still produced and used in some European and South American countries.
And special purpose guns, such as the Russian 23 mm (approximately 6 gauge), are rarely encountered. A 10-gauge ( 3 1 / 2″) shotgun shell shown next to a United States quarterThe 10 gauge narrowly escaped obsolescence when steel and other became required for, since the larger shell could hold the much larger sizes of low-density steel shot needed to reach the ranges necessary for waterfowl hunting. The move to steel shot reduced the use of 16 and 20 gauges for waterfowl hunting, and smaller 2¾″ (70mm) 12 gauge shells as well. However, the advent of the 3.5 in (89 mm) 12 gauge shell, with its higher pressure rating compared to standard 12 gauge guns, begin to approach the performance of the 10 gauge loads. Newer nontoxic shots, such as and -nickel-iron alloys, and even tungsten- blends, regain much or all of the performance loss, but are much more expensive than steel or lead shot. However, laboratory research indicates that tungsten alloys can actually be quite toxic internally.
Shotgun Barrel Wall Thickness Gauge For Sale
Sizes found in the UK 4' (100mm) 3¼' (83mm) 10 bore 2⅝' (67mm), 2⅞' (73mm), 3½' (89mm) 12 bore 1¾' (45mm), 2' (51mm), 2¼' (57mm), 2½' (63mm), 2¾' (70mm), 3' (76mm), 3½' (89mm) 14 bore 2½' (63mm) 16 bore 2½' (63mm), 2¾' (70mm) 20 bore 2½' (63mm), 2¾' (70mm), 3' (76mm) 24 bore 2½' (63mm) 28 bore 2½' (63mm), 2¾' (70mm) 32 bore 2½' (63mm) 2' (51mm), 2½' (63mm), 3' (76mm).360 bore 1¾' (9 x 45mm) 9mm (No.3 bore) rimfire 0.5', 9mm (No.3 bore) long rimfire 1.4' 7mm (No.2 bore) rimfire 6mm (No.1 bore) short rimfire, 6mm (No.1 bore) long rimfire Conversion guide. Portrait of with his single-shot Boer rifle and African hunting regalia, 1876The below table lists various gauge sizes with weights. The bores marked. are found in punt guns and rare weapons only. However, 4 gauge were sometimes found used in guns made for coach defense and protection against piracy.
The.410 bore and are exceptions; they are actual bore sizes, not gauges. Barnes, Frank C.; Woodard, W. Cartridges of the world: a complete and illustrated reference for more than 1500 cartridges (15th ed.). Krause Publications. P. 629.
Carter, Greg Lee (2002). Guns in American Society: An Encyclopedia. Santa Barbara, Calif.; Oxford: ABC-CLIO. P. 361.
^ Frank C. Barnes (2009). Layne Simpson (ed.). Cartridges of the World (12th ed.). Clair Rees (March 2000). Guns Magazine.
Frank C. Barnes (2003). Stan Skinner (ed.). Cartridges of the World (10th ed.). Krause Publications. Randy Wakeman (2007). Archived from on 2006-05-13.
John Kalinich; et al. Environmental Health Perspectives.
113: 729–34.