Took the 5.45 training upper to the range for some drills. About 2 mags in I noticed some shots going into the white even thought I was calling the shot into center with my red dot. Upon closer inspection I noticed a few oblong holes. Put another mag through to confirm and thats when I was really started getting keyholes. Aprox. 150 rounds before this session I was putting all my shots into the black 6" circle at 100 yards from prone. Ive never had a barrel go so suddenly from shooing just fine to keyholing in under 1 mag, usually I would see significant accuracy loss. The round count is ~10 1080 round spam cans of 7n6 and ~1k rounds of commercial Wolf 60gr with a moderate firing schedule of various drills and some mid range stuff to 300 yards. Barrel was cleaned between every 1-2k rounds.
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In both pics you can see where it was shooting normally circular holes to oblong to keyholes. All within a mag or 2.
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Originally Posted by adh
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