The Redding 81317 Neck Sizing Die is a dedicated reloading tool engineered for 6mm BR Remington cartridge cases. By resizing only the case neck while leaving the fire-formed body and shoulder dimensions unaltered, this die preserves the exact chamber fit of a specific bolt-action rifle. This targeted sizing method maintains internal concentricity, improves bullet-to-bore alignment, and prevents work-hardening of the brass walls for extended case longevity.

• Neck-Only Resizing: Calibrates the neck to accept standard 0.243-inch (6mm) projectiles without resizing the case body or pushing back the shoulder.
• Extended Brass Life: Minimises case stretching and eliminates unnecessary working of the cartridge shoulder and body brass.
• Enhanced Alignment: Retains fire-formed case dimensions to promote concentric bullet seating and tight alignment in rifle chambers.
• Standard Press Interface: Machined from hardened steel with industry-standard 7/8"-14 threads to integrate with standard single-stage and turret presses.

Specifications

• Part Number: 81317
• Calibre: 6mm BR Remington (0.243 in / 6mm bullet diameter)
• Thread Interface: 7/8"-14 standard thread
• Shellholder Compatibility: Redding Shellholder #1 (Part #11001) / Competition Shellholder #11601
• Internal Assembly: Decapping rod assembly (#32242), decapping pin (#01059), neck expander button (#39242)
• Die Body Material: Hardened steel

Who is the Redding 6mm BR Remington Neck Sizing Die for?

• Benchrest Shooters — Requires the 6mm BR Remington neck sizing die to preserve fire-formed brass dimensions on a standard 7/8"-14 threaded reloading press, eliminating body sizing to maximize shot-to-shot concentricity in custom bolt-action chambers.
• Varmint Hunters — Benefits from using this 6mm BR Remington neck sizing die paired with Shellholder #1 to extend the usable reload life of specialized varmint brass fired repeatedly in the same rifle chamber.

Less suitable for: Firearm platforms that require full-length resizing, such as semi-automatic, pump, or lever-action rifles where neck-only sizing leads to feeding failures and chamber jamming. It is also unsuitable for reloaders sharing fired brass across multiple different 6mm BR rifles or processing cases that have reached 3 to 5 firings; cases at this expansion threshold require a full-length sizing die or dedicated body die to restore chambering clearance.