The RCBS .300 Norma Mag Matchmaster Competition Full-Length Bushing Die Set (Model R31508) is a premium two-die system engineered for precision reloading of .300 Norma Magnum ammunition. Operating as a purely mechanical handloading tool, this set is built with standard 7/8"-14 threads, making it fully compatible with standard single-stage and turret reloading presses used by Australian shooters.

Key Features

• Full-Length Bushing Sizing Die: Resizes the entire body of the cartridge case. It utilizes interchangeable, self-centering neck bushings (sold separately) to control neck tension to precise increments of .001 inches, which significantly extends brass life.
• Titanium Carbo-Nitride (TiCN) Expander: Features a TiCN-coated expander ball on the decapping stem assembly, reducing friction and brass buildup while ensuring exceptionally smooth case extraction.
• Matchmaster Competition Seating Die: Features a free-floating, self-centering bullet seating stem and an oversized micrometer adjustment knob for precise bullet alignment.
• Bullet Seating Window: Features a convenient side-loading window with an internal bullet-retention sleeve, allowing users to drop the bullet directly into the side of the die to protect fingers and ensure perfect vertical alignment as the case is raised.

Product Specifications

• Model/Part Number: R31508 (also referred to as 31508)
• Calibre Compatibility: .300 Norma Magnum
• Thread Interface: Standard 7/8"-14 threads
• Micrometer Adjustability: Adjustable down to 1/1000th of an inch (.001")
• Neck Tension Adjustment Increment: .001 inches (determined by optional neck bushings)
• Material Finish: Case-hardened steel with a deep blued finish; TiCN-coated expander ball

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

• Competitive benchrest shooters reloading 300 Norma Magnum — who require precise control over neck tension in increments of .001 inches and bullet seating depth adjustments down to 1/1000th of an inch (.001") to achieve the extreme cartridge concentricity needed for competitive precision.
• Long-range precision shooters crafting custom 300 Norma Magnum loads — who utilize interchangeable neck bushings to fine-tune case tension to exactly .002" or .003" below their loaded cartridge neck diameter, minimizing brass fatigue and maximizing case life over repeated firings.

Less suitable for: reloaders attempting to process other .30 calibre cartridges; this die set is strictly engineered for .300 Norma Magnum cases and cannot be utilized to resize or load other .30 calibre cartridges, such as the .300 Winchester Magnum or .308 Winchester, due to distinct differences in headspace and chamber dimensions, which require calibre-specific dies.