RCBS 15340 MatchMaster Competition Seater Die .300 Win Mag

The RCBS 15340 MatchMaster Competition Seater Die is a purpose-built bullet seating die for the .300 Winchester Magnum, engineered to deliver match-grade seating accuracy in a single-stage reload.

At its core is a free-floating, self-centering bullet seating stem that aligns each projectile precisely in the case mouth without deflection, virtually eliminating the smashed fingers and misaligned bullets common with conventional seating dies. A bullet seating window with retention system holds the bullet in place during the stroke so neck tension and bullet jump remain consistent round after round.

Seating depth is set with the oversized micrometer adjustment knob, which is large enough to read and turn easily even with gloved hands or under reloading-bench lighting. The die is machined from steel with a black finish and uses the standard 7/8"-14 thread pattern, so it threads directly into any RCBS press or any standard single-stage reloading press accepting that thread.

This is a seater die only and is designed for the precision rifle shooter who already has a dedicated sizing solution and wants the finest possible seating die for .300 Win Mag competition and hunting loads. Made in the USA.