The Lee Precision Shell Plate #16 is a required component for reloaders using a Lee Breech Lock Pro or Pro 4000 press to load a unique group of powerful, rimmed cartridges. Made from hardened steel, this shell plate allows for rapid caliber changes. It is specifically designed to hold two very different but popular cartridges, the .500 S&W Magnum and the 7.62x54R Russian. Owning the correct shell plate is the key to maximizing your press's high-speed capabilities for these calibers.