The Redding Tapered Size Button (.17 to 6mm) is a specialised reloading die accessory designed to gradually expand the necks of bottleneck cartridge cases. Manufactured from precision-machined, hardened heat-treated steel, this expander button features an elongated taper that steps case neck diameters up from as small as .17 calibre to a finished 6mm (.243 calibre) inner dimension. By progressively opening the neck, it reduces axial strain, minimizes case stretching, and prevents shoulder distortion during case forming and neck-sizing operations.

Key Features

• Gradual Neck Expansion: Utilises a continuous smooth taper to expand bottleneck brass necks up from .17 calibre to 6mm, reducing neck work-hardening compared to standard, abrupt expander balls.
• Hardened Steel Construction: Precision-machined from heat-treated steel to maintain dimensional consistency across repetitive sizing cycles.
• Broad Redding Die Compatibility: Threads directly onto standard decapping rods used in Redding Full Length Sizing Dies, Neck Sizing Dies, and Type "S" Bushing Sizing Dies.
• Concentric Neck Restoration: Straightens and uniforms dented or irregular case necks on fired 6mm cases to maintain consistent bullet grip and tension.

Specifications

• Brand: Redding Reloading Equipment
• Model Number: 19242
• Starting Calibre: .17 calibre
• Final Calibre: 6mm (.243 calibre) inside diameter
• Material: Hardened heat-treated steel
• Die Interface: Standard Redding Full Length, Neck Sizing, and Type "S" Bushing Sizing die assemblies
• Packaged Weight: Approximately 0.08 lbs (approx. 36 g)
• Packaged Dimensions: Approximately 2 × 3 × 0.5 inches (5.08 × 7.62 × 1.27 cm)
• Case Compatibility: Bottleneck cartridge brass only

Who is the Redding Tapered Size Button From 17 To 6mm for?

• Handloaders necking up small-calibre parent brass to 6mm — provides a gentle expander button taper that expands parent cartridge case necks starting from as small as .17 calibre up to a finished 6mm (.243 calibre) inner diameter without crushing case shoulders.
• Wildcat cartridge developers working with bottleneck cases — integrates with standard Redding Full Length, Neck Sizing, and Type "S" Bushing Sizing dies to progressively reform bottleneck brass to a final 6mm neck size with a compact tool weighing approximately 0.08 lbs.

Less suitable for: Reloaders working with straight-wall cases or brass that does not require necking up from .17 calibre to a final 6mm inside neck diameter; standard-calibre reloaders running high volumes of identical brass without small parent cases are better served by a free-floating carbide expander button or a dedicated neck expanding mandrel system.