Okay I have a new issue. This rifle got stripped and cleaned in my tank, so I am reasonably sure there is no cosmo causing issues, but you never know. I did the bolt too. After firing, the bolt will open and close just fine, no issues there. However, extracting the case is a bear. I will pop the bolt handle up, and then have to whack the bolt, from the muzzle towards the butt, to get the case to start moving. I am not seeing any expansion or splitting issues, but it does get marked with rub lines on it's way out. I do not see anything out of the ordinary on the bolt, and it does extract. I am thinking the problem lies with the steel cases I am firing, but I have not confirmed that it like brass any better yet. I have never had any of the 91/30's complain about this ammo (until now?). I did clean the daylights out of the chamber thinking I missed something, It was mildly better after that, but was not a solution. Anyone got any other ideas?