The RCBS MatchMaster Competition Bushing Neck Sizing 2-Die Set (Model 31510) is a high-precision, purely mechanical reloading tool engineered specifically for the .300 Norma Magnum cartridge. Designed to fit standard 7/8"-14 thread reloading presses, this specialized set focuses on maximizing cartridge concentricity and minimizing bullet runout. By sizing only the neck portion of the cartridge case, the set maintains the exact dimensions of brass fired from a single rifle chamber, reducing brass overworking while facilitating ultra-precise bullet seating via a highly adjustable micrometer head.

Key Features

  • Bushing Neck Sizing Die: Resizes only the neck of the case to maintain fired body dimensions. This die requires interchangeable neck bushings (sold separately) to control neck tension precisely.
  • Titanium Carbo-Nitride Expander Button: Reduces friction and brass buildup during extraction, eliminating the need for expander ball lubrication.
  • Micrometer Bullet Seating Die: Features an oversized, highly legible micrometer head allowing for precise bullet seating depth adjustments in increments down to 0.001".
  • Bullet Window & Retention Sleeve: Includes a convenient cut-out window in the die body for direct manual bullet placement, paired with an internal sleeve that aligns the bullet perfectly straight with the case mouth before seating begins.
  • Self-Centering Seating Stem: Features a free-floating, self-centering bullet seating stem that ensures near-zero runout for finished cartridges.

Product Specifications

  • Brand: RCBS
  • Model/MPN: 31510
  • Calibre Compatibility: .300 Norma Magnum
  • Press Thread Compatibility: Standard 7/8"-14 thread
  • Weight: 0.5 lbs (approx. 227 grams)
  • Dimensions: 4.5" W x 6.0" L x 1.1" H (approx. 11.4 cm x 15.2 cm x 2.8 cm)

Who is the Rcbs 300 Norma Mag Matchmaster Competition Neck Die Set for?

  • Competitive long-range precision shooters — require the RCBS Matchmaster Competition Neck Die Set because it delivers highly precise bullet seating depth adjustments in steps of 0.001" to control bullet runout for extreme shot-to-shot consistency in .300 Norma Magnum rifles.
  • Long-range hunters reloading for a specific bolt-action rifle chamber — benefit from this RCBS Matchmaster Competition Neck Die Set because it neck-sizes brass to match the exact fired dimensions of their specific chamber and mounts directly into standard 7/8"-14 thread reloading presses.

Less suitable for: Reloaders who need to process brass fired through multiple different firearms or those utilizing semi-automatic/gas-operated actions. Because this product is limited strictly to sizing the case neck, it does not resize the case body or push back the shoulder; for these applications, a full-length sizing die set is required to guarantee reliable chambering.

SKU RC39222LP
Model # R31510
Brand Rcbs
Shipping Weight 1.0000kg

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