577611 heavy skirt minnie
Super_D, I've had my minnie mold since about 1975 and cast some each year before hunting season. They will take as much powder as I can stand to shoot, but found 120gr of 3FFF works well and burns pretty clean.
South Paw, my hunting partner, does hobby blacksmithing, so his married son (Doc) comes over to help, and we have a production line of casting. South Paw melts lead on his forge in a 30 lb pot that we ladle into my 10 lb electric furnace. I cast with 3 or 4 moulds of different calibers. This keeps the molds from getting too hot. They have a few seconds to rest with a hot slug inside, waiting for Doc to knock the sprues off and dump the slugs into the correct tray, lined with a towel. We usually do 54 slugs, 36 RB, 58 RB, 50 RB and .358 slugs. Sometimes South Paw will get out his 30 slug mold - 150 RN (for 30-30 & 30-06). We just make an evening of it, and usually are good for the year. South Paw has an outdoor work bench next to the forge with a roof to keep the rain away.
I put a picture of my 50cal Lyman target, shooting 350gr TC Maxi hunter slugs in a RB barrel. It works, but the lighter 275gr slugs don't. Go figure. Many guys said it wouldn't work at all.
I'm attaching a photo of my very small powder flask I made from 1" copper pipe and soldered copper sheet on the ends and soldered a .250" copper pipe for the spout. The 1" pipe is 4" long, so the whole thing fits nicely in my small camera bag that serves as a minnie possibles bag for hunting. It has powder, slugs, extra nipple, musket caps, nipple wrench, 1 oz. of Break Free oil, and patches. Don't forget the safety pin for a nipple pick. Small bag, so it fits under rain gear and won't get in the way.
Smilin Jack