RCBS 15308 MatchMaster Full-Length Bushing Die Set .300 Win Mag

The RCBS 15308 MatchMaster Full-Length Bushing Die Set delivers precision reloading capabilities for .300 Winchester Magnum cartridges. This professional-grade die set incorporates interchangeable neck bushings that allow handloaders to control neck tension with surgical precision, producing ammunition that rivals factory match-grade rounds.

What Makes This Different

The MatchMaster series distinguishes itself from standard full-length dies through its modular bushing system and competition-focused design tolerances. Where conventional dies resize the entire case neck to a fixed dimension, this set allows selection from dozens of bushing sizes in 0.001-inch increments. The result is consistent neck tension that reduces bullet runout and improves accuracy potential by up to 30% compared to standard dies.

Key Features

• Interchangeable neck bushings available in 0.001-inch increments for precise neck tension control
• Full-length sizing capability maintains proper headspace and chamber fit
• Hardened steel construction with titanium nitride coating for extended service life
• Micrometer seating die with precise depth adjustment in 0.001-inch increments
• Competition-grade tolerances held to ±0.0005 inches for consistent case dimensions
• Includes shell holder, powder funnel, and detailed instruction manual
• Compatible with all standard 7/8-14 TPI reloading presses

Match shooters and precision hunters rely on this die set for ammunition that consistently groups under 0.5 MOA at 100 yards when paired with quality components. The controlled neck tension prevents bullet setback during feeding while maintaining the consistent bullet grip necessary for uniform powder ignition. Weather-sealed storage case protects the dies and bushings from moisture and contamination during transport to matches or hunting camps.

Technical Specs

• Caliber: .300 Winchester Magnum
• Thread: Standard 7/8-14 TPI
• Die body material: Hardened tool steel with TiN coating
• Included bushings: Typically 0.332", 0.333", 0.334" (verify specific sizes)
• Seating die: Micrometer adjustment with 0.001" graduations
• Case length compatibility: 2.620" maximum
• Country of origin: United States
• Warranty: RCBS lifetime warranty against manufacturing defects

Serious handloaders choose RCBS MatchMaster dies when accuracy cannot be compromised. The investment in precision tooling pays dividends through improved group sizes and more consistent ballistic performance across temperature and environmental conditions.