So what I found with mine is that it might not be the primer at all. If the die set is set to deep/shallow , it can effect the angle that the primer feed and primer arm in the ram intersect. I just set up another for a buddy and he was getting ready to shim the safety prime a the mount until we got the die corrected ( just a 1/2 turn as I recall.) I run two of these myself I can tell you that once it is set up right, it will run like a clock for 10's of thousands of rounds. It is worth the effort IMHO.

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Dave