and had a notable lack of success. Trouble was, after firing one or two rounds some of the others in the magazine would not allow the slide to close completely. And occasionally, before firing, one or two would not allow it when cycled through by hand. Drove me nuts.
Well, a while back I bought one of the Lee Factory Crimp Dies for the cartridge and tried it again. Maybe the crimp from the seating die just wasn't cutting it; if I seat only with that die, then use the FCD to do the crimp, the stuff works fine. Today was the second time I've put a couple of magazines of Hornady 90-grain hollowpoints through, all with no problem.
I'd still like to know exactly what the problem was, but I can live without it.