Keyholing question.

[pontiacpratt]

AR guru's I need some help here.
I was shooting my AR yesterday and looking at the target I found one keyhole. My Question is: Is this indicative of a growing issue with my hardware or can this just happen as a fluke?
Accuracy isn't noticeably effected. Muzzle crown appears to be undamaged
Gun info:
CMMG 16" 1/9 Chrome lined barrel with a YHM Phantom flash hider. about 2000 rounds down the pipe
Ammo:
Tula 55 grain steel case .223
Thanks guys.

[CSACANNONEER]

Only one? I'm going to guess that you were at a range and someone else fired the shot that happened to make it to your target. Or, it could have been a poorly made bullet that was severly off balance, undersized, wrong bullet for your twist rate, etc. Check your muzzle by doing a simple bullet test. If it fails, obviously, your barrel is shot out. If it passes, go back and try it again. My best WAG is that you just got a bad projectile in the cheap arse ammo you were shooting.

[pontiacpratt]

Bullet test? I'm unfamiliar with that.
I kinda figured that it was the cheap ammo. My buddy suggested that the bullet was out of balance. Thanks you CSACANNONEER for reaffirming my suspicions