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Aside from all of the things mentioned above (powder, case cleaning media, shavings, etc.) I had a manufacturer induced issue. The large primer ram I received had "tit" about .03 dia. and .015 or less high (didn't measure) right in the center of the ram where it had not been machined flat. Of course this caused dimples in every primer seated. Being a "do it yourself" type like most everyone that reloads, I simply removed the ram and carefully filed the tit flush with the rest of the ram's primer contact surface.....problem solved.
Just wanted to offer another possible cause for the dimple problem.....it can happen.
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