I suppose you could do 500 effectively - maybe more. Let us know! Or maybe I'll press my luck next time and do 5 or 600. I never really reload more than 300 rounds in a session, so that would be 2 sessions-worth. Regardless, as you say... faster than a tumbler.Thanks, SARDG. That's a little disappointing but even doing 300 in 15 min. is not bad. I usually run my steel pin tumbler for 2 hours.