There are a wide variety of ctgs. that can use (real) black powder with soft cast bullets and excel at it.
Mostly those with decent bore size and sloping shoulders are best as the cases must be cleaned on the inside. Straight water is what I use, running from the tap. I use a pair of long nosed hemostat pliers to hold a long, narrow piece of scotch-brite cloth, that does the scrubbing under the running water - primers already removed. It takes only a few seconds per case.
There is no need for a pre-soak in vinegar or other stuff in water at the range.
Running cool water from the tap, the hemostats with scotch-brite = perfectly clean cases.
Water wet cases can to laid on a cookie sheet and 30 minutes to an hour at 160F to 170F will dry them without injury.