Never used anything but the real stuff. the BP loads that works best for me are 42grn of Goex 2ffg and 38grn of Swiss 2ffg. in my shiloh. (Its almost sacralige to me to use anything but the real stuff) but Some one gave me 2 lbs of the RS. Will never buy any more and want to use this up for practice. W/o haveing to do a lot of testing and using it all up doing so. Whats a good starting point With goex to swiss I droped 10% and it worked out. seams 10% work in all my Guns Musket, carbine ,henry, and pistols.