Thank you , for all of you for your input. Over the years I have dabbled in rolling blocks, sharps, modern trapdoor, civil war muzzel loaders and I have a copy of Pat Wolf 's book that I have read many times. I just recently acquired an original 1889 trapdoor infantry rifle, with a beautiful bore. I am very aware about using smokeless powders in these old thunders, and black power here is very scarce. So I wanted to load some light smokeless , because that is what I have. Hodgdon used to make a black powder substitute called MZ Black that was non corrosive, my 1876 45-60 winchester got the last of that. Hunkpapa