The RCBS .338 Weatherby Rebated Precision Magnum (Wby RPM) Full Length Die Set (Model 28401 / R28401) is a specialized two-die system designed for bottleneck rifle cartridge reloading. Constructed from proprietary die steel, this set enables handloaders to resize fired brass back to SAAMI minimum dimensions and seat bullets to precise depths. Operating entirely as a mechanical tool without electrical components, this die set is legal to own and use across all Australian states and territories without licensing for the tool itself.

Key Features

• Two-Die Configuration: Includes a dedicated Full-Length Sizer Die and a specialized Seater Die to complete the standard bottleneck reloading process.
• Full-Length Sizer Die: Features an integrated expander-decapping unit that expels spent primers and expands the case neck to the exact internal diameter required for optimal bullet tension.
• Vented Sizer Design: Engineered with integrated vents that prevent trapped air pockets and allow excessive case lubricant to escape, protecting brass casings from shoulder damage or lube dents.
• Seater Die: Equipped with a bullet seater plug and an integrated roll crimper to seat and secure the bullet in a single operation.

Specifications

• Brand: RCBS
• Model Number: 28401 / R28401
• Calibre Compatibility: .338 Weatherby RPM (Rebated Precision Magnum)
• Thread Interface: Standard 7/8"-14 thread
• Material: Proprietary die steel
• Included Components: Full-Length Sizer Die (with Expander-Decapping Unit), Seater Die (with Bullet Seater Plug and integrated roll crimper)
• Operating Requirements: Manual case lubrication required for every cycle

Who is the Rcbs 338 Wby Rpm Full Length Die Set for?

• Handloaders developing precision hunting ammunition — require a specialized .338 Weatherby RPM reloading die set that resizes bottleneck brass cases back to minimum SAAMI dimensions to achieve consistent neck tension on .338-calibre bullets.
• Reloaders utilizing standard benches — require a standard 7/8"-14 thread interface to install these RCBS reloading dies directly into their existing single-stage or turret presses.

Less suitable for: High-volume reloading or alternative large-calibre rifles; this set is incompatible with cartridges outside the .338 Weatherby RPM calibre (such as standard .338 Lapua Magnum or .338 Win Mag) and will not fit oversized 1-1/4"-12 presses without a reduction bushing, meaning a wider-threaded die set or standard-calibre carbide die is required for those applications.