The Redding Type S Bushing Neck Sizing Die for .243 Winchester Improved 40° (MPN 71420) provides precise neck resizing and neck tension control for fire-formed cases without sizing the cartridge body or disturbing shoulder dimensions. Designed for standard 7/8"-14 threaded reloading presses, it maintains the custom fit of fire-formed brass to a specific chamber while prolonging case life and improving concentricity.

Key Features

• Interchangeable Bushing System: Utilises interchangeable sizing bushings (available separately in 0.001" increments) to adjust neck tension and bullet grip precisely without overworking the brass.
• Self-Centring Free-Float Design: Holds the sizing bushing with slight clearance, allowing it to naturally self-centre on the case neck during operation to minimise runout.
• Adjustable Sizing Depth: The decapping rod assembly adjusts vertically to permit partial neck sizing, allowing reloaders to size the top portion of the neck while leaving the neck base fire-formed to the chamber.
• Versatile Decapping Options: Includes both a standard size expander button and a decapping pin retainer, enabling sizing with or without an internal expander ball.

Specifications

• Manufacturer Part Number (MPN): 71420
• Calibre Compatibility: .243 Winchester Ackley Improved (.243" / 6mm bullet diameter)
• Shoulder Angle: 40°
• Press Thread: Industry-standard 7/8"-14 thread
• Shellholder Compatibility: Redding Shellholder #1 (Part #11001) or Competition Shellholder #1 (Part #11601)
• Tool Weight: Approximately 250–350 g

Who is the Redding Type S Bushing Neck Sizing Die for .243 Winchester Ackley Improved for?

• Precision handloaders loading for .243 Winchester Ackley Improved bolt-action rifles — sizes only the neck of cases fire-formed to a 40° shoulder angle, allowing reloaders to maintain exact chamber fire-forming while threading directly into standard 7/8"-14 single-stage or turret presses.

Less suitable for: Reloaders encountering stiff bolt lift or chambering resistance requiring shoulder bump of 0.001"–0.002", or those processing brass fired across multiple different rifles, who require a dedicated body die or a full-length bushing sizing die.