[Unclenick]

If you look under magnification, you will probably see that the final height of the cups was set by something resembling a belt sander. The burrs from these make the primers much harder to seat than, say, a Federal primer. CCI had the same problem before they revamped their production process in 1992. The old ones (I still have a few) absolutely would not seat completely in my Dillon Square Deal B, but new ones do. TulAmmo primers won't seat easily for me, either. Same issue.