And just for those that aren't careful enough and put a primer in upside down, and even worse take it to the range and attempt to fire it, I was present when this happened.
The round didn't go off but there was a muted pop. Bolt could not be opened. Trip to gunsmith who removed barrel as part of the repair. Primer had blow the extractor claw out of its position which was the cause of the bolt being unable to be opened. Extractor muted.
Another one many years ago, same muffled bang and trouble opening bolt although barrel didn't need removing. Extractor blown off. Cause - no flash hole in the catridge case. IIRC the case was very hard to remove from the chamber.
Also aware of many occurrences of "dry balling" ie no powder. Muted pop, projectile driven fwd. Sometimes easy to tap out other times further up the barrel as in the case of @Tech
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