I have around 4000 45-70 cases that I use in my two Gatling guns. One is a Thunder Valley 10-barrel reproduction and the other is an 1877 Colt Bulldog. Hard cranking will produce around 300 rounds per minute as long as a loader is keeping the Bruce Feed stocked up. The smokeless charges are light with a 385gr Magma Master caster boolit. The cases are pin tumbled and dried and fed into a Dillon 1050 Super. The case mouths are belled as they go around the shell plate and a crimp secures the boolit when seated. A good crimp is required as the boolits cannot slip into the case as a jam usually results. Some of my cases have been loaded 10 times or more. I do not experience much case mouth splitting but the sides of the cartridges show tiny blow holes and splits. These are culled out and go into the scrap cartridges bucket. I never anneal the cases! If I get a dozen loadings or more out of a cartridge case I am happy. Always on a quest for 45-70 empties.