Had my first experience with shallow primer pockets this past summer. On my buddies 300 PRC, with his once fired Hornady Match brass, and as usual I cleaned up the primer pockets real good with a Hornady power case prep tool. Thought I reamed the pockets out good and still got slightly high primers. Those primers have been used in other stuff with no problem. Figured those primer pockets are a bit out of spec and planning on trying to get 'em a hair deeper next time with the power tool. No issues with function in the gun, they chamber & shoot real good.