What’s wrong ? Chamber, brass, dies

[Dt219]

Update today from lilja email . Carson claims the first thing he done was check the chamber dimension. He said sammi specs for a 6.5 grendel has a base diameter of .4437. He said my fired brass measured .4445. He said while its slightly over sammi specs he would not call it oversized. As far as the machine marks goes He said they send out all barrels like that with the chatter marks in the barrel he called them contour marks and his dad and him decided the barrels look better that way. He said he could polish them out if I wanted before he sent the barrel back. I replied since neither of my other 2 grendel barrels caused brass to look like that and he said it was slightly out of spec that I loved how it shot but did not want that barrel back for safety reasons, and I would not feel comfortable selling the barrel and the buyer have the same issues or worse have a case separate. Will let horde know what happens next. What say you ?