I had a similar problem years ago with my 300 Wby.

by MR, Sunday, April 19, 2015, 16:36 (3446 days ago) @ Hoot

It was the belt on the brass wearing down after a few reloads and having enough give to lessen the primer strike. New brass fixed the problem completely.

Check the belts on the brass and see if they still have a reasonably sharp edge. There was some difference in looking at them, but it was very slight to the eye.


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