I prefer an old school small flask with a measuring spout. I'm with Hawg Pyrodex or holy Black. I like the pellets for my 209 ignition rifle. Convenience rules in the field. OP sounds to me like you have balls large for bore size. Can you measure the cylinder bores? A pair of 20 dollar calipers is all you need. I once received a Pietta .44 with 3 different sizes of cylinder bore out of the six. I still have the replacement that was provided, Traditions did make it right, on my nickel for freight. It was not easy to get them to even have a look at it. They relented when I told them what the measurements of the cylinders were. Bad enough only 3 of the 6 would shave a ring of lead from the same box of Speer balls. Loose is especially bad, the balls can come off the powder under recoil.