The Redding 55172 Competition Handgun Seating Die is a precision reloading tool engineered specifically for 9mm Luger (9x19mm Parabellum / .355" projectile diameter) cartridges. Built with standard 7/8"-14 threads, it integrates into single-stage, turret, and progressive reloading presses. The die uses a patented spring-loaded, free-floating internal seating stem and tight-tolerance alignment sleeve to fully support both the cartridge case and bullet ogive before seating begins, eliminating bullet runout and ensuring straight-line concentricity. It acts strictly as a dedicated seating die with no built-in crimp function, allowing precise control over Cartridge Overall Length (COAL) without applying radial force to the case mouth.

Key Features

• Micrometer Depth Adjustment: Top-mounted micrometer provides direct depth adjustments in 0.001-inch increments with zero-set functionality, enabling repeatable COAL changes across different projectile profiles.
• Straight-Line Alignment Sleeve: Patented internal floating seating stem guides the projectile and case into alignment before seating begins to reduce bullet runout.
• Dedicated Seater Design: Performs pure seating with no crimping feature, isolating seating depth from case mouth crimping operations.
• Progressive Press Compatibility: Features an entry radius chamfer at the base and extended 7/8"-14 body threading to facilitate smooth feeding on progressive toolheads.

Product Specifications

• Manufacturer Part Number (MPN): 55172
• Calibre: 9mm Luger (9x19mm Parabellum / .355" projectile diameter)
• Die Thread Size: 7/8"-14 standard metallic reloading press thread
• Adjustment Graduation: 0.001" (infinitely adjustable without click stops)
• Crimping Capability: None (dedicated bullet seater only)
• Operation: Manual mechanical operation (requires no electrical power)

Who is the Redding Competition Handgun Seating Die for 9mm Luger for?

• Handgun competitors in IPSC, Steel Challenge, and Action Pistol disciplines — requires uniform Cartridge Overall Length across high-volume production, which this 9mm Luger competition seating die achieves using a micrometer calibrated in 0.001" increments to eliminate bullet runout.
• Handloaders conducting 9mm precision load development — relies on precise projectile seating depth changes in 0.001" steps on a 7/8"-14 threaded press without introducing radial crimp pressure during the seating stroke.

Less suitable for: Reloaders assembling heavily compressed powder loads (which resist the internal spring-loaded floating stem mechanism) or those loading calibres other than 9mm Luger; standard 2-in-1 combination seat-and-crimp dies or calibre-specific non-competition handgun seating dies are better suited for those applications.