Incidentally, if you cast bullets for these "punkin rollers", soft lead won't work. Maybe the rifling is too shallow, but accuracy didn't begin to be reliable until I switched to air-hardened wheelweights (just drop them from the mold and let them cool). If I switch over to smokeless powder and higher velocity, I may have to start water dropping to get them harder.
With black powder, I'm able to shoot just about indefinitely with no fouling problems by loading a 1/2" fiber wad, soaked in lube (actually, a mixture of beeswax and Murphy's Oil Soap), sandwiched between two 1/8" card wads directly under the bullet. This takes up quite a bit of room in the case, of course, but seems to keep the barrel fouling from building up.
