The Redding Type S Bushing Neck Sizing Die (MPN 71923) is engineered specifically for handloading .284 in (7mm) calibre projectiles in 7mm Remington Ultra Magnum (7mm RUM) cartridge cases. This mechanical reloading die controls case neck tension through interchangeable bushings while keeping the fire-formed body and shoulder of the brass intact. It mounts to standard reloading presses and provides precise neck resizing without overworking case necks.

Key Features

• Interchangeable Bushing System: Utilises freely floating Redding bushings (sold separately in 0.001" increments) that self-centre on the case neck to optimise concentricity and reduce runout.
• Adjustable Resizing Depth: The internal decapping rod adjusts to size either the entire case neck or a selected partial length.
• Dual Decapping Configuration: Includes a standard expander size button for commercial brass and a decapping pin retainer for sizing neck-turned brass without expanding.
• Standard Thread Mounting: Features an industry-standard 7/8"-14 thread pitch to ensure direct compatibility with single-stage and turret reloading presses.

Specifications

• Manufacturer Part Number (MPN): 71923
• Calibre Compatibility: 7mm Remington Ultra Magnum (7mm RUM) / .284 in projectiles
• Thread Pitch: 7/8"-14
• Packaged Weight: Approximately 0.3 kg
• Shellholder Compatibility: Redding Shellholder #6 (Part #11006) or Redding Competition Shellholder #11606 (sold separately)
• Operation Type: Manual mechanical reloading tool

Who is the Redding Type S Bushing Neck Sizing Die for 7mm Remington Ultra Magnum for?

• Long-range precision handloaders shooting 7mm Remington Ultra Magnum bolt-action rifles — requires precise neck tension adjustment via interchangeable bushings stepped in 0.001" increments on a 7/8"-14 thread pitch press to minimise bullet runout for consistent long-range accuracy.
• Reloaders seeking to extend brass life through neck-only sizing — works only the neck of fire-formed 7mm RUM cases using this 0.3 kg reloading neck sizing die, preventing excessive brass fatigue caused by repeated full-length case body sizing.

Less suitable for: Fired brass that has reached 3 to 5 firings where case shoulders stretch or body diameters expand to cause stiff chambering; switch to a full-length bushing sizing die or pair this neck die with a dedicated body die.