Thanks for the pictures.
Given the OP says:
Quote:
Other than the deeper indent, nothing else appears to be abnormal.
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I doubt there will ever be enough resolution to resurrect the idea that this was an over pressure event.
These normal looking primers are what you see in out of battery slamfires. I don’t know why the primers have normal firing pin indentations, but they do. I have seen two, the second blew the back end of the receiver off the rifle.
When the physical evidence is different from the theory, the theory must be wrong.
The slamfire cases I picked up, they were ruptured/cut about half to 2/3 rds of the way, this case is not ruptured so I am of the opinion that the loads were light.