Of the bullet moulds sold for reloading, the RCBS Silhouette Pistol Bullet Mould - Double Cavity is a top choice. This mould comes in options for different diameters, boasts a 3/16-inch sprue plate constructed from solid steel, and is made to stay in place using tempered steel spring washers and screws.Reloaders also like the solid cast iron material used for the blocks and that the blocks meet specifications to ensure a clean and accurate casting and are precision ground square. In addition, for perfect mating of blocks regardless of heavy use, steel alignment pins are part of the design.