The RCBS Matchmaster Neck Size Bushing Die Set for 6mm Dasher (RCBS part no. 12310) pairs a neck sizing die with a bullet seating die, both made from case-hardened steel with precision-drilled, hand-polished interiors. The changeable, self-centering neck bushing lets benchrest and long-range shooters precisely set bullet tension while keeping brass working to a minimum to extend case life. A titanium carbo-nitride expander reduces brass buildup for smooth extraction, and the seater’s exclusive loading window lets you drop a bullet in and simply run the press instead of balancing it on the case mouth. The oversized micrometer knob on the seater reads in .001 inch increments for genuinely repeatable seating depth.

Key Specifications

• Includes both a neck sizing die and a bullet seating die in one set.
• Uses a self-centering, changeable neck bushing (sold separately) to set exact neck tension.
• Sizing die features a titanium carbo-nitride expander for reduced brass buildup.
• Seater die has an exclusive loading window for dropping in and seating bullets safely.
• Includes a free-floating, self-centering bullet seating stem for concentric results.
• Oversized micrometer adjusts seating depth in .001 inch increments.
• Uses a standard 7/8-14 thread.
• Backed by a limited lifetime warranty.
• Made in the USA from case-hardened steel.

Frequently Asked Questions

Does this set include the neck bushing? No, the bushing is sold separately so you can select the exact neck tension you want.

How precise is the seating adjustment? The oversized micrometer knob adjusts seating depth in .001 inch increments.

Can I load a bullet safely with this seater? Yes, the exclusive loading window lets you drop the bullet in and run the press, instead of balancing it on the case mouth by hand.

Buy the RCBS Matchmaster Neck Size Bushing Die Set, 6mm Dasher

Benchrest-grade neck tension control and a seater that protects your fingers are a rare combination, and this set delivers both for the 6mm Dasher. Order this RCBS set from our reloading dies selection and we’ll ship it fast from our Lubbock, Texas gun shop.