![]() 223 can be safely shot in any firearm chambered for the 5.56 NATO cartridge. 223 Rem ammunition like the Norma Tactical. It is generally accepted that commercial. 125 more freebore,” say the white-coats bearing micrometers. 223, but the 5.56 commonly gets a longer throat. Chamber dimensions and rifling twist vary among the myriad AR-15s and bolt rifles barreled to. Service loads for the 5.56×45 NATO generate 58,500. ![]() 223 Remington is stoked to 55,400 CUP (Copper Units of Pressure), a level specified by SAAMI (the Sporting Arms and Ammunition Manufacturers Institute). Do you own an AR like this SAINT? Do you know what ammo to load in it? Well, listed case dimensions are the same, and each will chamber in barrels bored for the other. 223 and 5.56 as identical or at least interchangeable rounds.
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