5.56 NATO vs. .223 Rem: What’s the difference?
[caption id="attachment_29807" align="aligncenter" width="770"] So, which round is the 5.56 and which is the .223 Remington? Or are they both one or the other? They're both 55gr FMJ projectiles...[/caption] Maybe you just got a new rifle or want to sight in your latest scope. If you're grabbing ammo for your…