Looks to me very much like an out of battery discharge ... end of the case is expanded larger than the body of the case, and the bowout occurred in a place that would be unsupported if the case were not fully into the chamber.
In fact ... look at the rear section of the case ... you can see a line that is likely to be the end of the chamber and the chamfer on it!
Bad business this one!
You were very lucky to be sure.
Mike
Last edited by mstarling; 12-07-2009 at 09:07 PM.
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