Do you have any issues when operating the bolt with no ammo in the rifle? No, polish the chamber. Yes, Conflict between the Primary Extraction cam and the bolt lugs. lug abutments. Back off the BAS about one turn and if it operates smoothly you will need to do a baffle mod or replacement.
You may have pressure issues and you are really having to work the primary extraction cam to get the fired case moving. Look at your cases and primers to see if there is a tattle tale for high pressure. Measure your fired case base and compare to new brass.
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