5.56 ammo for an m4

[mert986]

So i reloaded a 100 5.56 ammo the other day for my m4 using hornady new deminsion dies and the cases kept getting stuck in the chamber before i go out and buy the 5.56 small base dies which is what i think is the problem i wanted to check out what other people had to say. The bullets shot fine it was just a pain to extract them if i didn't actually shoot a round off. thanks Ryan

[BackAtchya]

Was the brass you are using fired before?