I have cast using only pure soft lead and some a few boolits from wheelweights. I have some old molds that I inherited and want to try a formula of 1 pound wheelweight and .08 oz 95/5 plumbers solder. Is this a good formula for 7 mm TCU, 357 Max mid range loads? It works out to be 10 lbs wheelweight and .5 lb 95/5 solder w/o flux core. Does anyone have other recommended formulas