Out of a non-chrome lined 1x9 twist 16", I have recovered several targets with puncture holes that resemble the exact shape of the side profile of a bullet. Each target was stapled to a tree so I wasn't sure if the weird shape was due to actual tumbling or if the unique green-tip LAP bullets mis-shaping immediately upon impact. Shooting regular Winchester 5.56 55gr FMJ, the hole is a perfect circle as I am used to. This PMC X-Tac 62gr LAP ammo has produced these weird holes up to 40 yards, yet has been just as accurate. Are my bullets tumbling and why? Is this bad for the barrel? The round also feeds a bit rougher than the regular FMJ, however the rifle has never skipped a beat while firing the. Not one hiccup. I have invested in hundreds of these rounds so I am sort of stuck unless this is normal for what I should be expecting with this round.