Standard load was 2 3/4 drams = 75 grains of real powder, probably Fg, under a Burton/Enfield bullet ("Minie ball".) A rifle musket is not a magnum.
Load the same VOLUME of fake. There are a lot of measures available marked in the "grains volume" oxymoron. Close enough.
777 is hotter than real powder or other fakes so don't soup it up. The gun will likely stand it but will the skirts of the Minie?
I bet a top hat cap will fire 777.
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