I bought a used LBT mold .458-70 500gr oversized for my Trapdoor rifle. Wondering if I use 16-1 or 20-1 lead tin that the bullet will drop at .460 or greater. I have not used the mold, still getting supplies to cast. I cannot find anything about this mold online. I also bought a NEI .460-466 mold as sell still have not used it. Hopefully these two molds will drop awesome bullets for my Trapdoor rifles. Any info or guidance will help. Thank you. 1st time casting.