The Redding Type S - Match Bushing Neck Die Set for .300 Winchester Magnum (MPN 38153) is a precision 3-die system engineered for neck-sizing fire-formed brass and seating projectiles with minimal runout. Built around industry-standard 7/8"-14 threads, the set includes a Type S Bushing Neck Sizing Die, a dedicated Body Die, and a Competition Bullet Seating Die. The system isolates case neck sizing while preserving fire-formed dimensions, and it incorporates a micrometer-adjustable seating head calibrated in 0.001 in increments for precise control over projectile seating depth.

• Precision Bushing Sizing: Uses interchangeable steel or titanium carbide bushings (sold separately) to control neck tension in 0.001 in increments without overworking the brass.
• Self-Centring Floating Bushing: The neck die features a free-floating bushing pocket and an adjustable decapping rod, supplied with both a standard expander button and a decapping pin retainer for bushing-only sizing on neck-turned brass.
• Dedicated Body Die: Resizes the case body and bumps the shoulder back without contacting or working the case neck.
• Competition Seating Die: Features an internal alignment sleeve that supports the cartridge case before bullet seating begins, paired with a free-floating seating stem and a micrometer calibrated in 0.001 in graduations.

Specifications

• Brand: Redding Reloading Equipment
• Model / MPN: 38153
• Calibre Compatibility: .300 Winchester Magnum (.308 in projectile diameter)
• Die Set Composition: Type S Bushing Neck Sizing Die, Body Die, Competition Bullet Seating Die
• Press Interface: 7/8"-14 thread
• Micrometer Adjustment: 0.001 in increments
• Packaged Weight: Approximately 0.8–1.0 kg

Who is the Redding 300 Win Mag Type S - Match Neck Die Set for?

• Precision long-range rifle handloaders — requires the micrometer seating die calibrated in 0.001 in increments and interchangeable bushing system of this 300 Win Mag reloading die set to minimise runout and precisely tune neck tension on fire-formed .300 Winchester Magnum cases.
• F-Class and benchrest competitive shooters — utilises the dedicated body die and floating bushing neck die to maintain exact chamber concentricity and control shoulder bump across standard 7/8"-14 thread reloading presses without overworking brass.

Less suitable for: Reloaders feeding semi-automatic rifles, hunting in severe conditions, or sizing brass across multiple different .300 Winchester Magnum rifle chambers; a full-length sizing die set is recommended instead to ensure dependable chamber clearance and feeding. Additionally, when reducing neck diameter by more than 0.008–0.010 in in a single operation, reloaders should step down using intermediate bushings to prevent brass wrinkling or shoulder distortion.