Yes, musket caps and triple 7 do work. Vorderlader-Zundhutchen are suppose to be the best, small round, red plastic container from Germany, all I use. Stick with 100 grn T7 and 348 grn powerbelt and you will nock -em dead! Heard lots of negative crap about powerbelts lately but I have had great luck. Just keep that powder dry, and hit them were you are soppose to.
Greg