Lee Full-Length 3-Die Set .577/450 Martini/Henry (Large Series Thread 1-1/4"-12)

The Lee Full-Length 3-Die Set .577/450 Martini/Henry (Large Series Thread 1-1/4"-12) is designed for serious handloaders who work with this historic military rifle cartridge. Originally used in the British Martini-Henry rifle, this caliber remains popular among historical reenactors, collectors, and precision ammunition enthusiasts. This die set provides the essential tools needed for consistent and accurate load development.

The three-die configuration includes a full-length sizing die, a bullet seating die, and a powder-through expanding die, which is standard for bottleneck cartridge reloading. The large series thread format (1-1/4"-12) ensures compatibility with Lee's heavy-duty single-stage and turret press platforms. Lee Precision's die construction utilizes hardened steel to withstand repeated sizing cycles while maintaining the necessary dimensional accuracy.

This die set is ideal for handloaders restoring or maintaining Martini-Henry rifles, ensuring reliable performance for both original and modern reproductions. Its compact footprint and weight of 2.5 lbs make it easy to organize on a reloading bench without sacrificing durability. Handloaders can expect decades of reliable performance from this well-engineered set.