Mine also smudged the case head similarly. Also at times had tight bolt lift, inconsistent. All I was able to use reliably was nickel plated Federal cases until the bolt was trued. It was shaving brass from beneath the rim; Federals maybe had a rim thickness a few micrometers thinner or nickel made a difference or something, so they would work and others not so much. I would take it to a good gunsmith and have them do some measurements to make sure things are true and squared up. My guy is a picky machinist type, found it quickly.
I’ve seen this with dirty chambers. I’ve also seen it with some Weatherby factory ammo in 300wby. No issue re bolt lift, and I was able to get multiple reloads out of the same brass.... It also shot .5 moa. I have had quality rifles with an apparent tight chamber that showed pressure signs with near minimum recommended loads. Chronograp showed velocity was in fact at full speed. My point is every rifle is different. You may have a problem, or even a couple things going on.
Seeing that you have federal brass, I'm going to assume you are shooting federal factory ammo. I've seen a lot of their ammo do that. Not quite as bad as yours though. I live about 30 miles from federal's Anoka, MN plant and know several people that work there, so naturally a lot of people shoot federal ammo in my area. I pick up a lot of range brass for loading in factory rifles from local ranges. With all the federal brass I see that often. I would try some different ammo before you get worried about anything else, if you haven't already tried other ammo.