I can't help with the case, but I made some for the .38 special using #8 shot and using gas checks over the powder, and a paper wad over the lead. I used calking to hold the paper in place. They pattern good enough for snake shooting at the short distances that they should be used for snakes, and penetrate very good. I have seen on the net where they just put the calking directly over the lead shot, but I did not try that. It would make one large projectile, I would think, that would do damdage if it hit. I would also think that it would be kinda like a Frisbee and go to unknown places. I think Rocky has some info on making snake shot in a .45 but I could be thinking of somebody else. miles
