Dwight, you didn't say anything about the circumstances or what sort of loads were involved in your failure cases.
In the one case I've seen the breech block lost the lower front edge, the edge that would be adjacent to the feed ramp in battery. I suspect an overpressure load was involved with a case failure in the feed ramp area as is typical of 1911's when over loaded. I also suspect the luger case has better support in this area than the 1911 so the effects of an over load might be more variable.
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