Okay, so I have a pretty basic question, but first let me explain what I'm NOT asking. I'm not asking if I can shoot 5.56x45mm in a .223 rifle. I'm not asking the difference between .223, .223 Wylde, and 5.56x45. I know what a crimped primer pocket is. ALL of these reloads will be fired in 5.56 chambered rifles.

I'm looking to buy some brass in bulk for my AR so that I can really put my XL650 to good use. The best deals on brass involve mixed lots of once-fired 5.56 & .223. Am I going to run into any problems down the road by using the brass interchangeably in moderate handloads? Should I pay more for brass that is all 5.56 but still contains mixed headstamps? I'm not after match accuracy, and I understand there's a pressure difference between the two, but I would not be loading my plinking rounds to maximum anyway.