I know no cast but they work. Rifle has tube mag so have to use RNFP Lead. Can't use black powder so need a good thumper. Have been using 300 gr Underwood but getting to expensive on retirement. What mold would you use? I am using 16-1 and 20-1 for my .45-70 trapdoor. What lead mix should I use for the Ruger, as lead is not recomminded, for the Ruger's gas system but works as long as I clean good.