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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) of the barrel. Gauge is 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 ...
The 20-gauge shotgun, also known as 20 bore, is a type of smoothbore shotgun. 20-gauge shotguns have a bore diameter of .615 in (15.6 mm), while the 12-gauge has a bore diameter of .729 in (18.5 mm). [ 2 ] 12-gauge and 20-gauge shotguns are the most popular gauges in the United States .
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.
For example, the barrel of a 12-gauge shotgun is equal to the diameter of a 1/12 of a pound lead ball (0.729 in) and a 20-gauge can fit a 1/20 pound lead ball (0.615 in). Using this method, a .410 bore is equivalent to a (hypothetical) 67-gauge, instead of the incorrectly labeled 36 gauge (0.506) in Europe and South America. [14] [15]
The gauge number is determined by the weight, in fractions of a pound, of a solid sphere of lead with a diameter equal to the inside diameter of the barrel. So, a 10-gauge shotgun nominally should have an inside diameter equal to that of a sphere made from one-tenth of a pound of lead. Each gauge has a set caliber.
The exit end of a choke is smaller by some dimension than the actual bore of the barrel. This difference in diameter is the amount of constriction. 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.
Barrels: Barrels have ultimately been offered in lengths from 18 inches (460 mm) to 30 inches (760 mm) in 2-inch (50 mm) increments. Barrels have been chambered for 12, 16, or 20-gauge with either a 2.75-inch (70 mm) or 3-inch (76 mm) chamber. They have been offered with fixed choke (IC, M, F, Skeet and CB) or with Winchoke attachments.
Shoulder designates the barrel diameter in front of the thread portion; ... Saiga 12 gauge shotgun 111/128"-33.87 M22.23 1.814 mm Some rifles in 12.7 mm caliber