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What do you think?
A friend of mine is an avid reloader and shooter. He's a retired AF EOD guy so he's the cerebral over analytical type.
Okay here's the problem:
Armalite AR-15 has approximately 10k rounds through it
Using an EOTECH sight
Distance is 65-80 yards
No wind
55 gr Nosler bullets
(I don't know the powder load but its consistant same with the cassings)
Barrel recently was shortened from 20 inches to 16 inches a bird cage M-4 style flash suppressor was added as well.
He shot approximately 450 rounds and approximately 5% of his rounds key holed the target. Meaning they smacked the target at a solid 90 degree angle. It didn't matter if he was at 65, 70, 75, or 80 yards they still hit at a 90 degree angle. The key holed rounds are still with in a 3 inch group of the normal rounds fired. Normal group is 1 inch or less.
So here's what we are thinking:
Either deformed bullets, but not detectable to the naked eye.
Or with the recently chopped barrel and new flash suppressor there is a scag or something that is shaving 5% of the rounds that are flying out of the barrel.
Think my guesses are on track or are we way off?
What do you guys think it might be?
And finally what should we do to determine what the problem is? (i.e. what or how to troubleshoot it).
Thanks for the help.
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