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The bore is the inside of the barrel of the gun.

Bore dimension for most rifles is caliber, which is the bore diameter in fractions of an inch or in millimeters. Some older big game rifles had designations such as "12 bore", which is bore diameter the size of a shotgun barrel of the same gauge.

Gauge is the number of round balls fitting the bore that can be made from a pound of lead.

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14y ago

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