Squaregrouper
Kragaphile
OP. One question. Do you case gauge every round you've reloaded? I'm not sure if this can cause such a problem, but out of every 1K rounds I reload, I get 4 or 5 rounds that refuse to case gauge. I've gone through the trouble of pulling the bullet and primer, resizing the brass, and reloading. Success rate for that runs about 50%.
No, I don't. Actually, never have! Except for the earlier AR10 that had the ejector swipe problem, I was checking rounds when trying to track down that problem, which was solved with an adjustable gas block.
Is that a standard practice?
It is with me. I don't think everyone does. I load so many, I figure chances are, I'll have a problem if I don't.
YMMV
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I look at it as a 2 second insurance policy.