Yesterday my Dad and I went with a family friend so he could take the HCP. While he was in the class I shot 200 rounds of Privi Partison .40sw through my Glock 23 without an issue at all. When it got time for him to do his shooting portion he used my Glock and Federal fmj target ammo. The instructor noticed that my gun was sending metal shavings into the target. It was literally making tears in the target. After his shooting test I put a target up and shot a few more rounds of my Privi Partison from 3 yards to see if it shaved any and once again in ran perfect. Should I be concerned with my gun or put it off as an ammo issue? I have put a total of 600 rounds of Privi Partison through it with no issues. It was just the Federal that did it.