Olter,
If you want black powder loads, without all the hassle of cleanup, use some CleanShot powder. It has the characteristics of BP, without the mess or corrosion.
I use it in many of my old Marlins, and single shot rifles, with excellent results. One note though; the cases need to be washed in soapy water at the end of the shooting day. It will still corrode the brass, even though it wont hurt steel.