"Anybody else had anything like this happen?"
Yep.
Pierced a .303 primer and had the No4 Enfield reset to full cock----after it blew past full cock and raked the sear bent over my thumb.
Bled a little.
I don't believe they put gas relief ports in Mauser bolts until the M98---and they never got around to it in the LE system.
-----krinko
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