Bullet Casting Alloy (10lb Ingot - 2% Tin, 6% Antimony, 92% Lead) Bullet Casting Alloy (10lb Ingot - 2% Tin, 6% Antimony, 92% Lead) Bullet Casting Alloy consists of 2% tin, 6% antimony and 92% lead - also known as "hardball" bullet casting alloy. You are purchasing 10lbs of this bullet alloy ingot, so if you need a total of 20lbs, simply order a quantity of 2 for this item. This modern version of the old Lyman #2 is an excellent all-around alloy. USAGE - This bullet casting alloy and is very good to use for casting. This item is one of our best sellers because of its versatility and ease of use. SIZE - Each piece of alloy is approximately 4.25 inches long by 2 inches wide by 1.25 inches high SPECIFICATIONS - Melting Point (F) = 621 | Atomic Mass= 207.2 | Boiling Point (F) = 3180 | Density (g/cm3) = 7.29 | Weight (lbs/in3) = 11.34 | Analysis: 2% Tin, 6% Antimony, 92% Lead. PACKAGING - This 10lbs of alloy will arrive sealed inside heavy duty BPA free plastic to prevent any corrosion or oxidation.