I have some Goex ffg black powder, and some Triple 7 BP substitute, but I have no smokeless powders at all. I'm brand new to reloading, but I've done quite a bit of research... but I haven't narrowed down a particular powder that I want to use because nothing is available to get in my area.... The black powder and substitute is for reloading for an original Springfield Trapdoor from 1884. I've casted 405 gr lead bullets, and I was planning on using my Dillon 550B to reload them, but then I read that you're not to use black powder in Dillon's powder measurer due to static electricy..... But I didn't know if Triple 7 would create too much pressure for it being an old trapdoor.... Their site suggests 60 grain load, but they don't tell what pressures it would exert.... And I don't know what other powders to use for 45-70, except maybe TrailBoss, which I can't find.... So I may be purchasing a Hornady black powder powder measurer, if it will work with the Dillon 550B (which I think it will) So after all that rambling, what should I do?