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left-to-right: .410 bore, 28 gauge, 20 gauge, and 12 gauge shotgun shells. The six most common shotgun gauges, in descending order of size, are the 10 gauge, 12 gauge, 16 gauge, 20 gauge, 28 gauge, and .410 bore. [3] By far the most popular is the 12 gauge, [3] particularly in the United States. [4]
The resulting answer is the diameter of the shot in hundredths of an inch. For example, #2 shot gives 17−2 = 15, meaning that the diameter of #2 shot is 15 ⁄ 100 or 0.15 in (3.8 mm). B shot is 0.170 in (4.3 mm), and sizes go up in 0.01 in (0.25 mm) increments for BB and BBB sizes.
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.
Shotguns come in a wide variety of calibers and gauges ranging from 5.5 mm (.22 inch) to up to 5 cm (2.0 in), though the 12-gauge (18.53 mm or 0.729 in) and 20-gauge (15.63 mm or 0.615 in) bores are by far the most common.
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.
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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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