10mm CBOB Issue

[Stagger Lee]

Dan Wesson 10mm CBOB, ~300-350 rounds fired.

No FTF or FTE, but ejected brass is getting pinched by the ejection port and getting all boogered up. It's also putting brass/nickel markings on my slide. When it happens the casing spins vertically out of the port and lands either on me or right next to me; when it doesn't happen the spent brass flies 15-20 feet away. Fired some remanufactured 180gr FMJ that I got at a local range and about 1 in 3 rounds did this. Also fired some awesomely cheap Ultramax reman. stuff and there wasn't a single instance. Fired some Winchester SuperX 174gr Silvertip HP and some of those cases ended up pinched. The picture I attached to show the case damage sucks, but I think you can tell what I'm talking about. There's also some scratching around the ejector groove (not sure of the nomenclature) on the case.

I checked the FAQ sticky and could not find anything exactly like my problem. Recoil spring obviously springs to mind, but maybe it's weak loads or the notorious "break-in period." Any thoughts?

Also, anyone know of a good 1911 gunsmith in the Eastern WA/Northern ID area?

Thanks.

 

[Riss]

Is either being caused during the slide opening and eject phase or the closing phase during recoil. Seems that Tuner Old Fuff or someone well versed in the 1911 should be able to answer that pretty easily. Might be best to address the issue to them directly