Hornady 546251 Custom Grade Series III 2-Die Set 6mm ARC Reloading

The Hornady 546251 Custom Grade Series III 2-Die Set delivers precision reloading capabilities specifically engineered for the 6mm ARC cartridge. This professional-grade die set combines full-length sizing and bullet seating operations in two hardened steel dies that maintain consistent chamber dimensions and optimal bullet alignment. Reloaders achieve match-grade ammunition with repeatable neck tension and precise overall cartridge length control.

What Makes This Different

Series III dies feature Hornady's Sure-Loc lock ring system that prevents die movement during extended reloading sessions, eliminating the need for constant readjustment. The sizing die incorporates an expander ball designed specifically for 6mm projectile diameters, reducing case neck deformation compared to universal expanders. Internal die geometry matches SAAMI 6mm ARC specifications within 0.001-inch tolerances, ensuring chambered rounds meet factory ammunition standards.

Key Features

• Full-length sizing die with 6mm ARC-specific expander ball and decapping pin
• Bullet seating die with built-in crimp adjustment for consistent bullet hold
• Sure-Loc lock rings with set screws prevent die position changes
• Heat-treated alloy steel construction rated for 50,000+ sizing operations
• Internal surfaces honed to 8 RMS finish for smooth case extraction
• Compatible with standard 7/8-14 TPI reloading press threads
• Includes detailed reloading data sheet with powder recommendations

Field testing demonstrates consistent cartridge overall length variance within 0.003 inches when properly adjusted. The sizing die returns fired 6mm ARC cases to SAAMI minimum dimensions while the seating die accommodates bullet weights from 95 to 123 grains without modification. Precision rifle competitors report improved accuracy consistency when switching from factory ammunition to handloads produced with this die set. The crimp adjustment feature proves particularly valuable for semi-automatic platforms where consistent bullet retention prevents feeding malfunctions.

Technical Specs

• Caliber: 6mm ARC (6mm Advanced Rifle Cartridge)
• Thread pitch: 7/8-14 TPI standard reloading press mount
• Die material: Heat-treated alloy steel with black oxide finish
• Package contents: Full-length sizing die, bullet seating die, Sure-Loc rings
• Compatible bullet weights: 95-123 grain projectiles
• Manufacturing tolerance: ±0.001 inch SAAMI specification compliance
• Country of origin: United States

This die set represents the standard for 6mm ARC handloading among competitive shooters and precision rifle enthusiasts. The combination of SAAMI-spec dimensions and Sure-Loc reliability eliminates common reloading variables that affect accuracy. Professional reloaders choose Series III dies when consistency matters more than initial cost.