RCBS Full Length Die Set - Group A - Popular Rifle Cartridge .338-378 Wby

The RCBS Full Length Die Set - Group A - Popular Rifle Cartridge .338-378 Wby is purpose-built for precision reloaders working with bottleneck rifle cases, specifically the potent .338-378 Weatherby Magnum cartridge. This two-die set serves experienced handloaders and competitive shooters who demand consistency and accuracy across their ammunition production. Whether you're preparing rounds for long-range hunting, precision rifle competitions, or building match-grade ammunition, this die set provides the foundation for repeatable, safe reloading cycles that meet SAAMI specifications.

The set includes a Full-Length Sizer Die with integrated Expander-Decapping Unit and a Seater Die equipped with a Bullet Seater Plug. The Full-Length Sizer Die resizes the case exterior to SAAMI minimum dimensions while simultaneously decapping spent primers, ensuring uniform case geometry from round to round. The Seater Die delivers precise bullet seating depth and consistent neck tension, critical variables for velocity uniformity and shot-to-shot accuracy. RCBS engineering and manufacturing tolerances guarantee that case dimensions remain within specification, preventing pressure anomalies and feeding issues in demanding rifle platforms chambered in this magnum cartridge.

This die set is compatible with standard single-stage and progressive reloading presses that accept Group A die stations. Reloaders working with the .338-378 Weatherby Magnum—a premium long-range cartridge favored in precision rifle competition and magnum hunting applications—will appreciate RCBS's reputation for dimensional accuracy and durability. The compact 4.3 x 1.6 x 5.9-inch profile fits easily into reloading benches and storage systems. For handloaders committed to ammunition quality control and consistency, this set eliminates guesswork and delivers the precision necessary for sub-minute-of-angle performance.