I buy roof flashings from a local junk yard and I believe they are all produced locally by the same manufacturer. I melt them down and flux the material three times to get out impurities. I then put 15# in my lead pot along with 1/2# tin from Buffalo arms. I am assuming I get close to a 30:1 ratio and I have shot it successfully in my .40/65 for a while. I WOULD LIKE INPUT.