Lee's aluminum mold blocks are expertly crafted to deliver reliable performance and convenience for bullet casters. Designed to resist rust, these molds heat up and cool down faster than traditional iron or steel molds, allowing good bullets to be produced after only a few casts. The lightweight construction one-third the weight of iron or steel reduces fatigue during extended casting sessions, making them ideal for high-volume production. To ensure optimal results, the mold block halves are CNC-machined for superior roundness and size consistency, resulting in precision-crafted bullets. The weights provided are based on Lee's suggested alloy, but actual weights may vary depending on the alloy mixture used. Lee's Modern Minie Ball Bullets are among their most accurate designs, known for producing clean, sharp holes in targets and delivering exceptional performance in the field or at the range.