Lyman 7690104 MSR Precision Die System 300 Blackout Reloading Dies

The Lyman 7690104 MSR Precision Die System delivers match-grade ammunition consistency for 300 Blackout cartridges through advanced engineering and precision manufacturing. This professional reloading die set addresses the unique requirements of modern sporting rifles with enhanced case preparation and bullet seating accuracy.

What Makes This Different

Unlike standard die sets, the MSR Precision system incorporates a micrometer-adjustable bullet seating die that provides repeatable seating depth within 0.001 inches. The full-length sizing die features an expander ball designed specifically for 300 Blackout brass dimensions, reducing case neck tension variations by 40% compared to generic dies. Premium heat-treated steel construction ensures dimensional stability across thousands of reloading cycles.

Key Features

• Micrometer bullet seating die with 0.001-inch repeatability for consistent cartridge overall length
• Full-length sizing die optimized for 300 Blackout case dimensions and shoulder angle
• Precision-ground expander ball reduces case neck working and extends brass life
• Heat-treated alloy steel construction rated for 10,000+ reloading cycles
• Compatible with standard 7/8-14 thread reloading presses
• Includes detailed setup instructions and load data reference guide
• Lock rings with set screws prevent die movement during operation

This die system excels in precision rifle applications where ammunition consistency directly impacts accuracy potential. Competition shooters benefit from the micrometer seating adjustments that enable fine-tuning cartridge overall length for optimal magazine function and chamber fit. The sizing die's controlled expansion process maintains consistent neck tension, crucial for uniform bullet release and velocity standard deviation under 15 fps. Tactical applications gain reliability through proper case shoulder positioning that ensures reliable feeding and extraction.

Technical Specs

• Caliber: 300 AAC Blackout (.300 BLK)
• Thread specification: 7/8-14 TPI standard press mount
• Die material: Heat-treated alloy steel with corrosion-resistant finish
• Seating die adjustment: Micrometer with 0.001-inch graduations
• Set includes: Full-length sizing die, micrometer bullet seating die, shell holder
• Compatible with: Single-stage and progressive reloading presses
• Country of origin: United States
• Warranty: Limited lifetime manufacturer warranty

Serious reloaders choose Lyman's MSR Precision system for measurable improvements in ammunition consistency and overall shooting performance. The investment pays dividends through reduced flyers and tighter group sizes that standard dies simply cannot achieve.