I use a lee REAL bullet just lube and stuff easy to start. In my Kentucky long accurate out to 150 yards, that is me not the rifle. I use between 55 to 90 grains pyrodec RS.
The molds come in different weights pick the one you want and use pure lead, cast and have fun. Also get a round ball and some pillow ticking great plinking fun cans, clays and water filled milk jugs. The more you shoot the better you are and know what the rifle and you can do. Also get the Lyman Blackpowder book, good reading and lots of great in
Keep powder dry
And HAVE FUN
Smokeploe