The Redding 41322 Size Button is a replacement expander button engineered for Redding bottleneck full-length sizing dies, neck sizing dies, and standard Type S sizing die decapping rod assemblies. Constructed from precision-machined, heat-treated alloy steel, this internal die component mounts directly to the decapping spindle assembly. As a fired case is extracted from the sizing die following external neck reduction, the size button travels through the case neck to expand the internal diameter to uniform dimensions, establishing consistent bullet tension and neck release across reload cycles.

Key Features

• Precision Expanding Action: Restores uniform internal neck dimensions and correct neck tension on .323-calibre cartridge brass during the upward press stroke.
• Heat-Treated Steel Construction: Precision-machined from hardened alloy steel to maintain dimensional consistency throughout regular sizing operations.
• Die System Compatibility: Designed to fit factory Redding decapping rod assemblies within full-length, neck sizing, and standard Type S sizing dies chambered for 8mm cartridges.
• Direct Factory Replacement: Serves as an exact replacement component for bent, worn, or missing size buttons in original Redding .323 die sets.

Specifications

• Product Name: Redding 41322 Size Button
• Manufacturer Part Number: 41322
• Calibre Compatibility: .323 calibre (8mm metric cartridges, including 8x57mm Mauser and 8mm Remington Magnum)
• Material: Heat-treated alloy steel
• Die Compatibility: Redding bottleneck sizing dies (full-length, neck, and standard Type S assemblies)
• Power Requirements: None (mechanical die component)

Who is the Redding 41322 Size Button for?

• Handloaders reloading .323-calibre hunting ammunition — provides a dedicated .323-inch expansion profile that restores factory-spec bullet grip and neck concentricity inside standard Redding bottleneck sizing dies.
• Reloaders reloading 8mm metric cartridge target rifle ammunition — delivers precise internal neck dimensioning for .323-calibre match brass when using standard steel expander assemblies.

Less suitable for: Firearm applications chambered for .318-inch early 8mm J-bore cases or non-.323 calibres spanning .30 to .338 calibre, which require calibre-matched expanders, as well as dry unlubricated resizing workflows where a free-floating carbide size button kit is required to eliminate case neck friction without liquid or mica lubricants.