JollyWhiteGiant:
For the best harmony and least chance of disappointment follow some basic preperation guidelines. Before shooting the Holy Black or Pyrodex you need to clean yer irons thoroughly with solvents that clean the heathern smokieless and then clean again with black powder technique which can be as simple as using hot soapy water to remove the solvent residue and then lubing with BoreButter or BP bullet lube. With the American Select substitute powder you may not need to do that and maybe not with 777 either. For just a few simple "let's see loads" with real BP I suggest ya charge sized/primed cases with 1.9cc ffg or fffg and press three layers of unwired medium brood foundation sheet over the case mouth before seating a 250gr lead boolit. The foundation sheets are avaialabe at feed stores or beekeeping supply places or online from beekeeping supply houses sucha s Dadant, Glorybee, Brushy Mountain, Rossman, or Kelly's. No need to melt out original UPS lube for this experiment. Seat pill to correct depth, crimp moderately, and the powder will be compressed under the wax. You will get a decent oad with some room for improvment if the "but" bites ya.
PRS