nbsp; by Frank Moss Here is a guide to ammunition calibers and their imperial or metric sizing. Inch Caliber Metric Caliber Typical Bullet Diameter Common Cartridges Notes .20, .204 5 mm 0.204 in .204 Ruger, 5 mm Remington Rimfire Magnum .22 5.56 mm 0.223-0.224 in .22 Long Rifle, .222 Remington, .223 Remington, 5.56×45mm NATO, 5.7 x […]
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