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For example, for a 12 gauge, the bore diameter of the barrel is nominally 18.5 mm (0.73 in), although different manufacturers do vary their as-manufactured bore from this diameter slightly. This is commonly called "overbore", when the as-built diameter exceeds the nominal actual diameter of 18.5 mm (0.73 in).
Gauge was determined from the weight of a solid sphere of lead that will fit the bore of the firearm and is expressed as the multiplicative inverse of the sphere's weight as a fraction of a pound, e.g., a one-twelfth pound lead ball fits a 12-gauge bore. Therefore with a 12-gauge, it would take 12 balls of lead of the same size as the 12 gauge ...
Thus, a 10-gauge shotgun has a larger-diameter barrel than a 12-gauge shotgun, which has a larger-diameter barrel than a 20-gauge shotgun, and so forth. M35 .410 shotgun cartridges for M-6 survival gun w/.22 long rifle for comparison. The most popular shotgun gauge by far is 12-gauge.
The choke typically consists of a conical section that smoothly tapers from the bore diameter down to the choke diameter, followed by a cylindrical section of the choke diameter. Briley Manufacturing, a maker of interchangeable shotgun chokes, uses a conical portion about three times the bore diameter in length, so the shot is gradually ...
12-gauge 21 in (530 mm) Vent Rib, Rem Choke Pump action with full Rem Choke. Matte black finish on barrel and receiver. Synthetic stock. Shoots both 2 3/4" and 3". [13] SPS Superslug 12-gauge 25 + 1 ⁄ 2 in (650 mm) Fully rifled extra heavy (fluted) Drilled and tapped sights, Matte black finish. Synthetic stock. [13] Fieldmaster 12-gauge, 20-gauge
The diameter of the wad slug is slightly less than the nominal bore diameter, being around 0.690 in (17.5 mm) for a 12-gauge wad slug, and a wad slug is generally cast solely from pure lead, necessary for increasing safety if the slug is ever fired through a choked shotgun.
It is manufactured in 12 gauge and 20 gauge; both will cycle 2 + 3 ⁄ 4-inch and 3-inch shells. A lightened version of the Model 11-87, the Model 11-96 , was offered in the late 1990s in 12 gauge only.
The USAS-12 (Universal Sporting Automatic Shotgun 12 gauge) is an automatic shotgun manufactured in South Korea by Daewoo Precision Industries since the 1980s. [ 2 ] Design