Is it absolutely necessary to remove the primer pocket crimp on 5.56 brass? Reason I ask, a guy next to me at a range session a month ago was shooting various brands of new ammo in a AR15. He shot about 200 rounds then packed up and left, leaving all the brass. Being the scrounge that I am, I picked up about 50 pieces of the best looking stuff. Got it home, cleaned, deprimed. I started priming it the other day and noticed a few times the primers took a bit more pressure to press into place. I looked, and found that I had primed 5 pieces of NATO brass. Marked LC 10 with the little circle cross. I presume this is Lake City brass made in 2010? So now I have 5 pieces of primed NATO brass that didn’t have the crimp removed. Trash it or shoot it?