The Lee 577/450 Martini-Henry Large Series (1-1/4-12 thread) 3-Die Set is specifically designed for use with the Classic Cast Press and is ideal for reloaders working with the 577/450 Martini-Henry cartridge. This set includes a Full-Length Sizing Die, Powder Through Expanding Die and Bullet Seating Die, providing all the essential components for resizing, expanding and seating your bullets. Additionally, the kit includes a Shell Holder and detailed Instructions to guide you through the reloading process. This die set is perfect for those reloading mixed range brass, ensuring reliable and consistent results with every reload. Designed for precision and durability, it is a must-have tool for reloaders looking to work with the iconic Martini-Henry cartridge.