Bore

Bore refers to the caliber of a gun; as a measurement it is generally used to refer to smoothbore guns such as shotguns and muskets and is generally used as equivalent to gauge which is the number of balls per pound of lead, later expressed in inches or millimeters; this use is generally archaic, though still used in British English and the sport of paintball where smoothbore barrels are standard. The exception is the .410 bore, which is .410 inches.

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