The .223 Remington (.223 Rem) is a rifle cartridge. It is commercially loaded with 0.224 inch (5.56 mm) diameter jacketed bullets, with weights ranging from 40 to 85 ...
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Andrew of Lucky Gunner Labs explores the differences between .223 Remington and 5.56mm NATO ammunition - and the results may surprise you!
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There is much confusion between the .223 Rem. and the 5.56 NATO rounds.