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To indicate the caliber and manufacturer, or specific type of cartridge. For example: .22LR means 22 long rifle, which is different that a .22 short. .40 S&W means .40 Smith and Wesson, etc. which is different than a 10mm, even though a 10mm is .40 inches in diameter. .45 ACP stands for .45 Automatic Colt Pistol, which is different than .45 GAP, which stands for .45 Glock Auto Pistol.

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