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Caliber is a measurement of the width of a bullet using the Imperial system. For example a .50 caliber round is 1/2 and inch wide, a .45 ACP round is .45 inches wide. The metric system is used in the same way, a 7.62 round is 7.62mm wide. Keep in mind these measurements are based on the physical bullet and not the casing as well. Rifle and assault rifle rounds typically have wider casings that bullets.

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14y ago

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