I've got a 67-1, my load consist of 158SWC(.358) MBC's, either hardness, 3.5 gr Bullseye. No barrel leading but after one or 2 cylinders full, I start having a chamber or two in which crud builds up requiring pushing the round extra hard to get it completely seated so I can close the cylinder and have it rotate. Was thinking about using it in a revolver match but until I figure out what's going on I would never make it through a stage with a couple reloads. I also tried Dardas bullets but same problem. It's not lead, it appears to just be powder fouling in the forward 1/4 of the chambers. This is a normal target load so not sure whats going on. Any thoughts from the collective wisdom here?