I decided I wanted to see what all the fuss was about running .45AR in my .45ACP revolvers. I picked up 250 new cases and didn't even bother checking which shell holder/shell plate I would need to load them. I mean, I have a full set of the Lee regular holders, a set of the x-press holders for the APP, and 9 Dillon caliber conversion kits that will cover like a bazillion calibers by mixing and matching. Or so I thought. The Lee sets omit several: #6, and #'s 12 through 18. The .45AR takes a #13 Lee and a "H" Dillon shell plate. Neither of which fit any other caliber! No big deal...I ordered a Lee 13 and a Dillon H and now, I'll just have to wait. I need the 13 Lee because my RCBS universal primer won't grab the rim and ends up launching it across the workbench when I try and seat a primer. I'll just have to prime using my hand primer that takes shell holders. I'll have to track down a #13 Lee x-press shell holder too, but at least I won't be depriming for a while.