So I'm new to the site, and new to casting. What got my fire lit to start casting was aquireing roughly a half ton of relatively pure lead (99.9% +/-). I think. It's old telephone line, I'm sure someone here has used it and knows more about than I do. I'm casting for 45 LC, 44 mag, and 41 mag as of now. In the mags I am shooting for 1200-1400 fps, what do I need to add to my lead to handle higher velocities?