This is a black powder cartridige correct? If so, you could contact the folks who sell Black Horn 209. They advertise that their powder can be used for 45-70 cartridges. I don't know anything about 45-70 but remembered seeing that so I figured I would mention it incase it helps.
Good luck!
Last edited by Colorado Cajun; 10-12-2010 at 06:47 AM.
Reason: Added text