RCBS 17601 Full-Length 2-Die Set Group A .300 Rem. Ultra Mag

The RCBS 17601 is a Full-Length 2-Die Set built for reloading bottleneck .300 Remington Ultra Mag rifle cases. Classified in RCBS's Group A die series, the set pairs a Full-Length Sizer Die with an integrated Expander-Decapping Unit and a Seater Die that includes a bullet seater plug and a built-in roll crimp for secure seating of your projectile. Together, the two dies cover the essential reloading steps: decapping the spent primer, resizing the case back to SAAMI dimensions, and seating and crimping a new bullet.

Both dies use the standard 7/8x14 thread pattern so they mount to virtually any standard reloading press. The full-length sizer brings the fired case body and neck back to specification, while the expander-decapping unit ejects the spent primer and bells the case mouth to accept a new bullet. The seater die then drives each projectile to your chosen depth and applies a uniform roll crimp suited to the .300 RUM cartridge, delivering consistent neck tension and a clean, repeatable crimp on every round.

A straightforward, no-nonsense die set for the reloader who wants to roll their own .300 Remington Ultra Mag ammunition for hunting or long-range work without buying extra components.