Odd 9mm brass

Joined
Jul 28, 2025
Messages
23
I was going through some of my brass and noticed this 9mm case with an odd looking "sleeve" inside the case, decreasing the case capacity I'm assuming. It took much more effort than normal to punch the primer out but it didn't look like it had a crimped primer. Does anyone know what this is? 1000021775.jpg1000021776.jpg
 
It's a manufacturing mistake more than likely. When I load 9 mm mixed head stamp I get a lot of variation in wall thickness, general case dimensions. For my good ammunition I had stamp sort. I've got a little personal list of head stamps that I just throw in the trash.
 
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