I've brewed with 3 year old grain before. Couldn't imagine not having my mill. The crush is fantastic and most of all repeatable. I just run my MM-3 with a mounted, old school 1/2" drill. Set about 030 Bought a speed control. It runs about 200 or so rpm. Bought the hopper w extension from Monster. Just ran a batch w 43# of grain and it held it w a little room. I've been really happy with it.