I didn't think I'd get very far with the .44 American, the only modern powder load data I have is a 200gr. Lead bullet, (Lyman mold 419180), over 5.5 grains of Unique. This is from Cartridges of the World 11th edition, printed in 2006.
They also list a factory load of 25.0 grains of FFg blackpowder with an unspecified 218 gr. bullet.
Ideal hand book number 34, printed in 1942, lists a load of of 4.5 grains of Bullseye under thier, and Lymans, 200 gr. bullet listed above, the 419180. Since your firearm is very old I'd back that down a bit, and stay there.
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