The Redding 75288 Steel Body Die is an alloy steel reloading die engineered specifically for the .300 Remington Ultra Magnum (.300 RUM) cartridge. Designed for modular precision reloading, this tool resizes the entire case body and bumps the shoulder back to restore correct headspacing without contacting or sizing the case neck. It operates without an internal decapping assembly or expander button, allowing handloaders to preserve exact neck tension established with dedicated neck-sizing tools while ensuring reliable chambering in bolt-action rifles.

Key Features

• Shoulder Bump and Body Sizing: Resizes case body diameters and sets back the shoulder without touching the case neck, maintaining custom neck tension.
• Decap-Free Design: Omits decapping rods and expander balls, allowing brass to be sized without altering neck geometry.
• Heat-Treated Alloy Steel: Machined from solid alloy steel for long-term dimensional stability during high-pressure reloading operations.
• Standard Press Integration: Features industry-standard 7/8"-14 threads to mount directly into single-stage and turret reloading presses.
• Shellholder Compatibility: Engineered to work with standard Redding Shellholder #6 (part #11006) or Competition Shellholder #6 (part #11606).

Specifications

• Manufacturer Part Number (MPN): 75288
• Material: Heat-treated alloy steel
• Calibre Compatibility: .300 Remington Ultra Magnum (.300 RUM, 0.308" bullet diameter)
• Thread Interface: 7/8"-14 standard reloading press threads
• Power Requirements: Purely mechanical operation (bench-mounted press)
• Required Shellholder: Redding #6 / Competition #6

Who is the Redding 75288 Steel Body Die For 300 Remington Ultra Magnum for?

• Precision handloaders loading for .300 Remington Ultra Magnum bolt-action rifles — requires dedicated .300 Remington Ultra Magnum chamber dimensions and standard 7/8"-14 press threads to bump the case shoulder 0.001" to 0.002" on fired brass without altering the neck diameter.
• Reloaders using separate neck-sizing dies — relies on a steel body reloading die built with standard 7/8"-14 threads to eliminate chambering resistance in .300 Remington Ultra Magnum cartridge brass while independently preserving neck tension previously set by bushing dies.

Less suitable for: High-volume processing of mixed brass or hunting ammunition where single-step decapping, body sizing, and neck sizing are required in a single pass (a full-length sizing die fits this better), or semi-automatic actions that require under-SAAMI case dimensions (a small base die fits this better).