Years ago, I bought two 4 lb. cans of 4759 to use in my original Sharps Borschart 45-70. In the Old, Old Lyman manual from 1959, it was recommended as a bulk powder for duplicating black powder loads.
I have used it extensively in the 45-70. A couple of years ago I started using it in my Rolling Block 577 Nitro Express. Worked great, so I tried it in an ancient German single shot bolt action conversion done on a French rifle from the Franco-Prussian War. (Never fired - only dropped once) The caliber (determined by chamber cast and a thorough perusing of Cartridges of the World) was 9.5X47R. I originally made brass by running 45-70 cases through a series of dies until they would fit the chamber, then fireformed them. The bullet I used was an old Winchester mold for the 38-55. I settled on a Lyman load for 38-55 since case volume is almost identical - 21 gr. 4759 and the 255 gr. 0.381 bullet. The velocity is 1850 fps, and the accuracy is great. My grandson uses it and knocked a squirrel off with a headshot at 25 yds.
I'm now embarking on loading for a 1892 Winchester in 32WCF made in 1918. Again, my ancient Lyman book lists 10 gr. 4759 with a 115 gr. lead bullet. Anybody tried this?
Actually, I'm anxious to hear about any loading done with 4759, since I load for a lot of cartridges.