The Redding Type S Bushing Full Length Resizing Die for .300 Remington Ultra Magnum (MPN 77288) provides precise case dimensioning and neck tension control in a single reloading step. Engineered for handloaders working with standard 7/8"-14 threaded reloading presses, this die restores fired .300 RUM cases to SAAMI body and shoulder specifications. It utilises a self-centering, free-floating neck bushing system that minimizes case neck runout and prevents the overworking of brass, maintaining consistent bullet retention across reloading cycles.

Key Features

• Precision Neck Tension Management: Accepts interchangeable sizing bushings (typically 0.334" to 0.342" for .300 RUM brass) in 0.001" increments to set exact neck tension without excessive brass sizing.
• Full-Length Resizing: Simultaneously restores the case body, bumps the shoulder to factory specification, and resizes the neck.
• Self-Centering Bushing Design: Allows the internal sizing bushing to float freely, aligning naturally with the case neck axis to reduce total radial runout.
• Adjustable Decapping System: Features an adjustable decapping rod assembly to control sizing depth, allowing either full or partial neck sizing.
• Dual Internal Assembly: Includes both a standard expander button and an expander-free decapping pin retainer for reloaders using turned-neck brass.
• Standalone Body Die Conversion: Removing the internal bushing and decapping rod assembly allows the unit to serve strictly as a shoulder bump and body die.

Product Specifications

• Calibre: .300 Remington Ultra Magnum (.308 in / 7.82 mm bullet diameter)
• Press Thread Size: Standard 7/8"-14 thread
• Physical Weight: Approximately 0.39 kg (390 g)
• Maximum Cartridge Overall Length (OAL): 3.600"
• Compatible Bushing Range: 0.334" to 0.342" (bushings sold separately)
• Shellholder Compatibility: Redding #6 standard or Competition Shellholders

Who is the Redding Type S Bushing Full Length Die for?

• Long-Range Hunters Reloading .300 Remington Ultra Magnum Ammunition — Requires precise neck tension control and reliable cycling in hunting rifles by restoring cases sized up to 3.600" OAL back to SAAMI specifications in a 0.39 kg steel die body.
• Precision Rifle Competitors Shooting .300 RUM Calibre — Utilises a self-centering bushing system within the standard 7/8"-14 thread die format to minimize concentricity runout and eliminate extreme velocity spreads over extended yardages.

Less suitable for: Reloading non-conforming cartridges such as shorter Ultra Mag variants (.300 RSAUM) or belted magnums (.300 Win Mag); these require calibre-specific full length sizing dies matched to their respective case tapers and shoulder angles.