Lee's aluminum mold blocks are designed with precision and convenience in mind, offering rust resistance and enhanced performance for bullet casters. The aluminum construction ensures rapid heating and cooling, enabling quality bullets to be produced after just a few casts. Weighing only one-third as much as iron or steel molds, these aluminum blocks reduce fatigue during long casting sessions, making them an ideal choice for high-volume casters. For unparalleled accuracy, the mold block halves are CNC-machined to achieve exceptional roundness and precise size control, ensuring consistent and reliable results. Lee's listed weights are based on their suggested alloy, though actual weights may vary depending on the alloy mixture used. Known for their exceptional accuracy, Lee's Modern Minie Ball Bullets create clean, precise holes in targets, making them a favorite for both practice and competition shooting.