5.56 vs .223: What’s The Difference Anyway?

By Sam Hoober

What’s the difference between 5.56mm NATO and .223 Remington, anyhow? The rounds are supposed to be interchangeable…kinda/sorta/maybe…right? The difference in the round itself: the NATO round is a little hotter. The case is the same size, but the powder charge, projectile and also rifle specifications differ. As a result, make sure to check your AR-15 […]

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Source:: Truth About Guns