My buddy and I are going in on a reloader so we have been saving and collecting brass in the calibers we want to load. My question is should I be sorting 223 brass based on if its 223 vs. 556, and if so how do you tell the difference? If it has the NATO cross does that mean its 556? Does this even matter? We don't have a precision AR setup so our loads will be for plinking and the likes. Thanks.