I would check the chamber first. From the scar on the case it looks like there is a burr at the neck, shoulder junction. When the case is fired and it conforms to the chamber, The brass is contacting a burr. When the bolt is turned on opening case is turning and the brass shaving is piled up on the right end of the scratch.
Coat the neck and shoulder of a loaded round with magic marker, load in the chamber and fire, If no mark from chamber, Time to coat a fired case and run through the die. May take a chamber or die polish to cure.
Good Luck in finding the problem then the cure.