My buddy has a 700 in 30-06 that he has had for years with no issues. He asked me to take a look at it because it started to become very difficult to close the bolt on an unfired round maybe 1 out of every 5 shells. This is factory ammo and it has had the issue with several ammo brands. I examined it and don't see anything obvious. There are actually some small brass shavings visible at different points on the bolt face. Any ideas?