Ok you pros out there. Let me set this up. New brass was fire formed, then neck sized. Loaded with 3 diffenrent loads (3 differenet bullets & diff. powder) Some rounds of all three loads would chamber but could not close the bolt to lock. Others would work fine. Let me say what it is not. The bullets were not seated too far out & into the lands. The rounds that would not chamber were taken home, bullets seated deeper, and still would not chamber. I have noticed some bright markings on the shoulders, it is on all the brass but more noticeable on some. I think the shoulders need bumped back a little, but what do you think. Gun is Sav Mod. 12 in 22 250.