Larry, just for grins let's check the ammo you are shooting. I'm having a hard time understanding how the rim could get behind the extractor unless the chamber was really hogged out. Took some measurements from unfired RST ammo rim dia. .918, head dia. .850. This fits pretty snug in my 10 ga. Also measured an old REM-UMC 8ga. unfired and came up with 1.018 rim and .930 head. What is the frame size of your gun? George
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