Brownells 25 to 1 Bullet Casting Alloy. Ingots weight roughly 5 pounds. This casting alloy is 25 parts Lead to 1 part Tin (96% Lead, 4% Tin). This gives a Brinell Hardness of appoximately 9. A popular Alloy for use in Cowboy Action Shooting and standard blackpowder cartridges such as the 45-70 Government. Made form virgin metals, not from scrap, ensuring you are adding clean alloy. Sold by the ingot, weights are approximate.