I have a Montana Xtreme X2 dunno how it shoots the only time I took it to the range I had problems with case extraction with factory Federal Fusion loads. After 3 shots I called it quits and it sat in the safe for a long time. Right now its at the gunsmith I'm guessing it has a rough chamber and the cases are sticking we'll see. There weren't any signs of excessive pressure on the cases.
I should have shot it right away when I bought it but I did not and by the time I did MRC was out of business, so I'll be paying for whatever the fix is on my dime. Hopefully honing the chamber takes care of the issue.
I'm also thinking about maybe getting the barrel cut down a bit (it's 24" from the factory) but I'd like to actually try shooting it for accuracy first as is.
