Herb,
What's the full story on this failure? It doesn't look like a case of simple overpressure. Calls to mind things like excessive impulse, weak recoil spring, fatigue cracks, etc. I would expect simple overpressure to take off the lower part of the breech face or the extractor. Did the primer let go? What did the case look like?
Of course overpressure can also be like lightning and do as it damn well pleases.
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