Jan
January 2, 2018
02
2018
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In small arms, the internal diameter of a firearm’s barrel or a cartridge’s bullet, usually expressed in millimeters or hundredths of an inch; in measuring rifled barrels this may be measured across the lands (such as .303 British) or grooves (such as .308 Winchester) or; a specific cartridge for which a firearm is chambered, such as .44 Magnum.

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