I have owned two of these rifles in the past and bought the off-the-shelf .520" round ball, but I may have a chance at another, and would prefer to have a mold. I guess I can give Ray at Rapine a call. I have a couple of his molds, and they are about as good as they get...although I have heard great things about Jeff Tanner's work as well. Correct me if I am wrong, but didn't Lee used to catalog a .520" RB mold?