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A 12-gauge shotgun, nominally 18.5 mm (0.73 in), can range from a tight 18 mm (0.71 in) to an extreme overbore of 20 mm (0.79 in). Some also claim an increased velocity with the overbored barrels, up to 15 m/s (49 ft/s), which is due to the larger swept volume of the overbored barrel.
This measurement comes from the time when early cannons were designated in a similar manner—a "12 pounder" would be a cannon that fired a 12-pound (5.4 kg) cannonball; inversely, an individual "12-gauge" shot would in fact be a 1 ⁄ 12 pounder. Thus, a 10-gauge shotgun has a larger-diameter barrel than a 12-gauge shotgun, which has a larger ...
While shotguns had been used in earlier conflicts, the trench warfare of World War I demonstrated a need for standardized weapons and ammunition. [2] Initial issue with each shotgun was one hundred commercial-production paper-cased shotgun shells containing nine 00 buckshot pellets 0.33 inches (8.4 mm) in diameter.
The SAAMI maximum permitted pressure limit is only 11,500 psi (79 MPa) for 12 gauge 2.75 in (70 mm) and 3 in (76 mm) shells, including shotgun slugs, so the typical operating pressures for many shotgun shells are only slightly below the maximum permitted pressures allowed for the use of safe ammunition. [19]
The US military M1030 breaching round is a 12-gauge, 2 + 3 ⁄ 4-inch (70 mm) shell that uses a 40-gram (1.4 oz) projectile made of powdered steel, bound with wax. [ 1 ] [ 2 ] The Clucas Method of Entry Hatton round is a 12-gauge, 3-inch (76 mm) magnum shell that uses a 43-gram (1.5 oz) frangible projectile, consisting of a high-density wax binder.
The size of the lead shot that is produced is determined by the diameter of the orifice used to drip the lead, ranging from approximately 0.018 inches (0.46 mm) for #9 lead shot to about 0.025 inches (0.64 mm) for #6 or #7.0 shot, while also depending on the specific lead alloy that is used.
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The larger the gauge number, the thinner the metal. Commonly used steel sheet metal ranges from 30 gauge to about 7 gauge. Gauge differs between ferrous metals and nonferrous metals such as aluminum or copper. Copper thickness, for example, is measured in ounces, representing the weight of copper contained in an area of one square foot.
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