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It looks like this round was not fired in a firearm chambered for 9mm Luger. Can you provide more details? What do you want to accomplish with this thread?
I don't own a .40 otherwise I may do something like that without proper supervisionDid you shoot a 9mm in your .40 S&W?
I will take a look at that, they all look alike. Looks like some "leakage"? browning the case on one side too.It looks like the firing pin hole in the breech face might be oversized, which would cause the primer bulging. On the other hand, it almost looks like the wrong primer. The top surface doesn't come anywhere near the edges of the primer pocket. Do they all look like that?
elsie
I think one of two possible problems. Since the 9mm case headspaces on the case mouth I would check the case length 1st. It may be too short causing the case to launch back when fired. The second possible answer the barrel may be flawed allowing the case to seat too deep. The case slams back on the breech during extraction causing the weird mark on the case. Send the gun back to Stoeger if this happens with different bullet brands.