I just bought a 45/90 Pedersoli replica Sharps and want to eventually shoot black powder out of it but at the present, I want to try some smokeless powder loads. I have an abundant amount of SR4759 which I use for a lot of my cast bullet loading. Does anyone have any experiance using SR 4759 with 45/90 loading? I will be using the 535gr Postell bullet. I have looked and cannot find any loading data using 4759. I just need a starting point and maximum data. Thanks