I'm just getting into the game after many years of using sabots, BP and substitutes. Actually I'm waiting on a build which should be very close. I'm ready to start sizing bullets, of which I have 500 of to start. I'll be shooting 3 different smokeless propellants that have been recommended by the builder, plus shoot BH209.
I'd highly suggest you take the advice of the person who manufacturers your/a rifle and stay away from "experimenting". Join either or both of the smokeless sites (Doug's - Hanks). If you're on FB, then join the Smokeless Muzzleloader Shooters Group. Guys in all those sites have been at this since the beginning and know their stuff.