The RCBS MatchMaster Neck Size Bushing Die Set is a two-die set engineered for precision reloading of .223 Rem / 5.56 NATO cartridges. The set pairs a neck sizing die with a dedicated bullet seating die and uses changeable diameter neck bushings to let users precisely control neck tension. Components are made from case-hardened steel with precision-drilled and hand-polished internal surfaces for consistent, long-lasting operation. The seater die features a large micrometer adjustment and a loading window to simplify seating and improve concentricity.
Key Specifications
- The set is intended for .223 REM / 5.56 NATO cartridges.
- Included dies: Neck Sizing Die and Bullet Seating Die.
- Neck tension is controlled by a changeable diameter neck bushing (bushings sold separately).
- The sizing die uses a Titanium Carbo Nitride expander to reduce brass buildup.
- The seater features a bullet seating window with a retention system for aligned seating.
- Seater has a large oversize micrometer for precise adjustment.
- The seater uses a free-floating, self-centering seating stem to improve concentricity.
- Thread standard on dies is 7/8″-14.
- The product is covered by a Limited Lifetime Warranty.
- The dies are Made in USA.
Designed for handloaders focused on match-grade accuracy and consistent case life, the MatchMaster neck-bushing set gives fine control over neck tension and seating concentricity without excessive case work. The combination of a precision expander, micrometer seater, and loading window streamlines repeatable seating operations, making this set well suited for benchrest, long-range, and precision-oriented reloading routines.
