Free: Contests & Raffles.
Yeah, always confusing. I was given a nice fat box of ammo at xmas, and opened it quickly to check out the round.... I screwed up, it was 5.56 and not .223. So I am sitting on some really nice Federal 5.56 that I cannot shoot.
I dont remember the reason but like Sebek said. You can shoot .223 and 5.56 out of a 5.56 chamber but should not shoot 5.56 out of a .223 chamber.