I'll throw a monkey wrench into the works. I've been using a Hornady auto prim, and like it real well. Had a RCBS, just didt'n like the way it felt, the lid came off and about 75 primers were on the carpet. Happened twice in 2 days, so sold it.
Bought the Hornady, comes with the adaptors, so you can use anybody's regular shell holder, and been happy ever since.(probably about 20,000 primers so far!!) Gypsyman