Brownells 40-to-1 bullet casting alloy consists of ingots weighing approximately 5 lb each. This alloy is composed of 40 parts lead to 1 part tin, equating to 97.5% lead and 2.5% tin. It provides a Brinell hardness of approximately 8.5. This softer alloy ensures consistent expansion and excellent weight retention when utilized at black powder velocities. Manufactured from virgin metals rather than scrap, it guarantees the addition of a clean alloy. The product is sold by the ingot, with weights being approximate.