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Factory ammo is hot.You are shooting a magnumb.I would guess the Remmy is is a little rough in the finish department, too.Unless you see flattened primers or bulges inthe casing, split necks, I wouldn't worry.
I shoot a Tikka .300 wsm w/ 180 grain factory loads and have never had an issue
I had the same issue last year with my browning 300 win mag with Fusion, I switched to federals and have not had a problem since
I shoot a tikka 300 WSM as well. Fusion 180 grains. no problems with the loads. the only problem I have it it kicks my butt from teh recoil....