Does anyone have a formula for calculating lead alloy bullet weight? For example, I have two .400” bullets each 0.900” long. One is pure lead and weighs 278 grains. The other weighs 228 grains, and I’d like to figure out its likely lead alloy content.
Math was never my strong suit, so forgive me if the formula for solving this is easy.
Thank you math geniuses in advance


NRA Life
FOAC Life
PA Federation of Sportsmen's Clubs Life
PA Trappers Association Life