What "gauge" describes in a shotgun. Example: 12, 20, 410.?
Answers:
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Shotgun gauges are determined by the number of lead balls of a given diameter required to make one pound of that size ball. Thus 10 balls of 10 gauge diameter are required to make one pound of such balls, or 20 balls of 20 gauge diameter are required to make one pound, and so forth. This is the traditional, and very old, system. The actual (nominal) bore diameters of the various gauges are as follows: 10 gauge = .775 inch, 12 gauge = .729 inch, 16 gauge = .662 inch, 20 gauge = .615 inch, 28 gauge = .550 inch. The .410 is named for its nominal bore size, and is not a gauge at all.Shot gun gauge refers to the inside diameter of the barrel. Except .410, which is technically a calibur (the inside diameter of a .410 is .41 inches)
10 gauge = .775 inch
12 gauge = .729 inch
16 gauge = .662 inch
20 gauge = .615 inch
28 gauge = .550 inch.
The most commonly used gauges are 12 and 20.
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