.518 360 grain. Two cavity mold custom-made exclusively for Lodgewood by Lee Molds. We personally worked with the engineers at Lee Molds to design an ideal bullet mold for .50 cal Civil War carbines. Dramatically reduces time spent casting bullets!! Because of the inherent variables that effect a cast bullet's size and weight, like casting temperature and antimony, we do not accept returns on bullet molds. Every mold is personally inspected by both Lee Molds and our staff to insure correct size and weight before shipment.