RCBS takes bullet casting seriously. Their Bullet Moulds are precision-machined from solid cast iron blocks to strict tolerances, ensuring accurate, clean and repeatable castings, cast after cast. The blocks are squarely ground before machining and steel alignment pins are used to guarantee perfect block mating, even after years of heavy use. Each mould features a 3/16 inches thick solid steel sprue plate, securely fastened with tempered steel spring washers and screws for durability. With a wide range of sizes and configurations available to suit various calibers and bullet shapes, RCBS Bullet Moulds are perfect for any application whether it's for plinking, precision hunting or target shooting helping you achieve the results you need every time.