I was able to shoot some of my own cast boolits again today. I have the water cooled separated from the air cooled and have them loaded with the same charge. The air cooled boolits leaded the barrel a bit and the water cooled boolits did not.
I did shoot quite a few of the air cooled boolits and was able to keep the barrel clean by putting a jacketed bullet in each mag. When I was finished shooting I loaded one mag with cast boolits and shot them. Cleaning was easy as the jacketed bullets cleaned all the lead out.