Originally Posted by huge29
So I pick up some Federal large rifle magnum primers as I have read how many people really like them and sure enough, they do seat in at least flush to where the brass does sit level and not rock like the CCI's and Remingtons both did.
I have a feeling that your primer pocket uniforming techique could be poor or the cutter is not square enough on it's cutting points and is leaving a radius in the bottom edge of the pocket . A good pocket is dead square to a sharp corner in the bottom of the pocket. A mistake many make is not stopping frequently to brush away the swarf .
If you do that you get to the full depth of the cutter .
I have never used anything except Sinclair and had no troubles.
Primers brands do vary in skirt ( cup) length by as much as .004 across the range . I don't see how a primer could rock even if it's not all the way down.