WMD, I am going to buy some .223 ammo from Widener's tonight but I don't know which one to pick. It will be shooting from a 16" JP Rifles stainless match barrel with a 1:8" twist. This is my longer-range target gun so I won't be blowing through multiple 30rd mags every range trip. Which one would you choose to shoot? The difference in cost is negligible. Should I be worried about the steel core in the M855 shooting through backstops/berms?