Ok, so this got me wondering so I bought a few of RCBS shellholders, 308/223. 308 definitely lines up better than the hornady, biggest thing I noticed was there did not seem to be as much slop side to side with the primer sleeve. It is a noticeable difference and I don't seem to have any bad primer seating issues. Now on the 223 shellholder, I could not get it into the press, seems the machining is just off a bit. I could tap it in with a hammer, but that just seems not correct, and I bought 2 shellholders, tried both with the same results. Thoughts??