Hornady 546365 Custom Grade 2-Die Set 300 RUM Sizing Seater Dies

The Hornady 546365 Custom Grade Series I 2-Die Set delivers precision reloading capabilities specifically engineered for the 300 Remington Ultra Magnum cartridge. This complete die set includes both full-length sizing and bullet seating dies, providing handloaders with the essential tools for producing consistent, accurate ammunition.

What Makes This Different

Hornady's Custom Grade dies feature precision-machined steel construction with tolerances held to within 0.0005 inches. The sizing die incorporates an elliptical expander that reduces case neck tension variations by up to 50% compared to standard round expanders. Each die undergoes individual quality inspection and comes with detailed dimensional specifications, ensuring consistent performance across production runs.

Key Features

• Full-length sizing die with elliptical expander for uniform case neck tension
• Bullet seating die with built-in crimp ring for secure bullet retention
• Precision-machined from high-grade steel with hardened surfaces
• 7/8-14 TPI threads compatible with all standard reloading presses
• Includes detailed loading data and dimensional specifications sheet
• Individual serial numbering for quality control tracking
• Polished interior surfaces minimize case marking and extraction force

The 300 RUM's high-pressure operating environment demands dies capable of handling the cartridge's substantial case dimensions and extended overall length. These dies accommodate bullet weights from 150 to 220 grains while maintaining consistent seating depth accuracy within 0.002 inches. The sizing die's internal geometry matches SAAMI specifications for the 300 RUM chamber, ensuring proper headspace and case life extension.

Technical Specs

• Caliber: 300 Remington Ultra Magnum (300 RUM)
• Thread specification: 7/8-14 TPI standard
• Die construction: Precision-machined steel with hardened surfaces
• Maximum cartridge overall length: 3.600 inches
• Sizing die includes: Decapping pin, elliptical expander, lock ring
• Seating die includes: Seating stem, crimp ring, lock ring
• Country of origin: United States
• Manufacturer part number: 546365

This die set represents the standard for precision handloading equipment among competitive shooters and serious hunters who demand consistent performance from their 300 RUM loads. The combination of precise manufacturing tolerances and proven design elements makes this an essential investment for anyone committed to producing match-grade ammunition.