As far as I know 223 and 5.56 cases are identical on the outer dimensions, at least that's what it shows in the Hornady manual as well as everything I've read on the web. The only real difference between the two are the chambers on the rifle. All of our rifles are the 5.56 barrel. We have two from PSA, one Colt, and one of them (my son's) I'm really not sure of the manufacturer but all are 5.56.

My military crimp remover should be here next week so I'll be able to load some 5.56 brass. Once I get into that I'll find out if it will all size the same or if it will have to be sorted by head stamp too. For now I'll be loading plain old blasting ammo and maybe get into more accuracy down the road.