The Redding .300 WSM Competition Bushing Neck Die Set (MPN 58223) is a precision 3-die reloading system engineered to minimise concentricity runout and provide micro-adjustable control over neck tension and bullet seating depth. Designed specifically for .300 Winchester Short Magnum cartridges using standard 0.308" diameter projectiles, this set interfaces with standard 7/8"-14 threaded single-stage or turret reloading presses. Built from heat-treated alloy steel, the set includes a Competition Bushing Neck Sizing Die (MPN 56223) with micrometer adjustment, a Body Die (MPN 75223) for bumping shoulders without altering neck tension, and a Competition Bullet Seating Die (MPN 55223) with micrometer control. Both the neck sizing and seating dies utilise tight-tolerance internal sliding sleeves that fully support the cartridge case body and ensure straight-line alignment throughout the reloading process.

Key Features

• Precision Micrometer Control: Top-mounted micrometer heads on both the neck sizing and seating dies are graduated in 0.001" increments for precise, repeatable control over neck-sizing depth and bullet seating depth.
• Full-Length Case Support: Internal sliding alignment sleeves support the .300 WSM case body and center the case prior to neck sizing or seating 0.308" diameter bullets.
• Interchangeable Bushing Design: Accommodates neck sizing bushings spanning a 0.334" minimum to 0.342" maximum range (bushings available separately), allowing fine-tuned neck tension without overworking cartridge brass.
• Dedicated Body Die: Enables resizing of the case body and bumping shoulder dimensions back by 0.001" to 0.002" without contacting or disturbing the cartridge neck.
• Standard Shellholder Compatibility: Works directly with standard #6 shellholders (MPN 11006) or Competition Shellholder Set #6 (MPN 11606).

Specifications

• Calibre: .300 Winchester Short Magnum (.300 WSM)
• Bullet Diameter: Accepts standard 0.308" projectiles
• Press Thread Interface: Standard 7/8"-14 thread
• Bushing Compatibility: 0.334" minimum to 0.342" maximum diameter bushings (sold separately)
• Set Configuration: 3-die set containing Competition Bushing Neck Sizing Die, Body Die, and Competition Bullet Seating Die
• Approximate Shipping Weight: 0.8 kg to 0.9 kg

Who is the Redding 300 Wsm Competition Neck Die Set for?

• Long-Range Precision Rifle Competitors — Need precise control over case neck tension and shoulder position for bolt-action platforms, relying on the 0.334" to 0.342" bushing diameter range and 0.001" micrometer graduations on this 300 WSM reloading die set to eliminate runout.
• F-Class and Benchrest Handloaders — Require exact straight-line bullet alignment using the standard 7/8"-14 thread interface and internal sliding sleeve system of this 300 WSM reloading die set to seat 0.308" diameter projectiles with minimal concentricity error.

Less suitable for: Handloaders loading for semi-automatic platforms or hunting rifles requiring reliable feeding across varying field conditions, where full-length sizing die sets (such as full-length match sizing dies) are required instead of neck sizing dies.