It started with my power pistol load work up with a 180gr acme lng...10.0gr of power pistol..1.255 col...I can't test it and been busy..I'm trying to get a chance and try out some underwood 180's to narrow it down..question is this..is over running the normal ejection process and popping out the magwell a sign of over pressure? Or does this occur with the mag out sometimes? The brass is unusable do a crease on the top..the lee resizer won't fix it. I'll chime in when I get the chance to try it again..this time with mag in and 9.6gr for some reason I think the load is hot and my recoil spring too weak...timing issue. .first time with power pistol and I like the accuracy I'm seeing