Lee Precision 90869 Factory Crimp Die 7mm STW / 7mm RUM Reloading

The Lee Precision 90869 Factory Crimp Die delivers consistent bullet seating and reliable case mouth crimping for 7mm STW and 7mm RUM cartridges. This die applies the same crimp style used in factory ammunition production, ensuring optimal bullet retention and feeding reliability in magnum rifle chambers.

What Makes This Different

The Factory Crimp Die system uses a collet mechanism that crimps the case mouth into the bullet's cannelure groove, unlike traditional roll crimp dies that can buckle thin-walled magnum cases. This approach maintains case integrity while providing superior bullet pull consistency. The die works with both cannelured and non-cannelured bullets, making it versatile for various projectile types commonly used in these high-velocity magnum cartridges.

Key Features

• Collet-style crimp mechanism prevents case buckling on magnum brass
• Compatible with both 7mm STW and 7mm RUM cartridges
• Works with cannelured and non-cannelured bullets up to .284 diameter
• Standard 7/8-14 threading fits most reloading presses
• Hardened steel construction with precision-machined collet fingers
• Includes detailed instructions and load data references
• Post-sizing crimp capability maintains consistent overall length

Reloaders working with these demanding magnum cartridges benefit from the die's ability to handle the substantial case capacity and high pressures involved. The consistent crimp pressure helps maintain uniform bullet seating depth, which translates to improved accuracy potential and reliable chambering in hunting rifles and long-range precision firearms. The die accommodates bullets from 120 to 195 grains commonly loaded in these calibers.

Technical Specs

• Caliber compatibility: 7mm STW (.284 Winchester Short Magnum), 7mm RUM (Remington Ultra Magnum)
• Threading: Standard 7/8-14 TPI
• Construction: Heat-treated alloy steel body with hardened collet
• Bullet diameter range: .284 inches
• Case length accommodation: Up to 2.850 inches (7mm STW), 2.850 inches (7mm RUM)
• Press compatibility: Single-stage and progressive presses
• Country of origin: United States
• Manufacturer warranty: Limited lifetime warranty

This Factory Crimp Die addresses the specific challenges of reloading magnum rifle cartridges where case integrity and consistent bullet retention remain critical. The precision manufacturing ensures reliable performance across thousands of reloading cycles, making it a practical investment for serious handloaders working with these powerful long-range cartridges.