Aluminum molds heat up and cool down faster than iron or steel molds and good bullets can usually be produced only after a few casts. In addition, aluminum blocks are one-third the weight of iron or steel mold blocks offering the bullet Caster less fatigue during extended casting sessions. To ensure the best possible bullets, mold block halves are CNC machined for unmatched roundness and size control. Weights given are Lee weights with suggested alloy; actual weight may Vary due to the alloy mixture used. Features: - tangential Cut-Off helps to eliminate the accuracy robbing NIP at the sprue - machined aluminum mold blocks and hard anodized sprue plate includes: - hardwood handles specifications: - material: aluminum - capacity: 1 - diameter: 0.459 inch - bullet style: flat nose - handle included: yes - gas check: no - bullet weight: 405 grains - mold caliber: 45-70 Government.