Good to hear . I have a mountaineer at Old Dominion rite now. Getting it bedded into a Matrix chassis and having a couple barrels chambered in 6br. Can’t wait.I shoot the mountaineer (pretty close to alpine) in PRS with mdt br mags and have no feed issues.
Jim recommends a m16 style extractor though versus his hook extractor if you’re going to shoot BR cases. The hook extracter pulls them at just the right angle the slip into the bolt lug recess and can ding up the necks which isn’t ideal.
Call Jim he can get you setup - I’ve put over 20k br rounds through mountaineer actions in the last 5 years