,Wallynut & Prairie; I've done it as both of you have mentioned. About 8-12 grains of Unique, Universal, or Herco (or anything of a similar relative quickness), a bit of fluff, and a teflon wrapped cast bullet. Works in .30-30 from 100gr to 170 grains, and the Lee mould in 7 x 57 Mauser (or rimmed). I think its good for any regular round.
The idea of Teflon, the wide gasfitters type - one wrap, is that it can be fired randomly mixed with jacketted bullets without blowing grouping.