Lee 90840 Factory Crimp Rifle Die 7mm-08 Remington Magnum

The Lee 90840 Factory Crimp Rifle Die for 7mm-08 Remington Magnum is a precision reloading die engineered to lock bullets down with more authority than standard seating dies alone. If you're serious about hand-loading ammunition that shoots tight groups, a factory crimp die is one of the most underrated upgrades in a reloader's toolkit. This Lee die applies a firm, controlled crimp that pushes the case mouth into the bullet's crimp groove, which raises the pressure threshold before bullet movement occurs—translating to a more consistent pressure curve, tighter velocity spreads, and ultimately better accuracy downrange.

The beauty of a factory crimp die is that it works even on bullets without a traditional crimp groove. Many reloaders find that adding this final step—after normal sizing and seating—tightens their groups noticeably, especially in magnum rifle rounds where pressure consistency matters most. The Lee collet mechanism squeezes the case mouth uniformly around the bullet, applying the same firm hold every cycle. This is particularly valuable for 7mm-08 Remington Magnum loads, where precision and consistency drive both accuracy and case longevity.

The 90840 fits all standard 7/8"-14 reloading presses, so it integrates seamlessly into your existing setup. Note that a shellholder is not included—you'll need the appropriate Lee shellholder for your 7mm-08 Remington Magnum if you don't already have one. Whether you're loading for a precision bolt rifle or a hunting magnum, this die brings factory-grade crimp control to your handloading bench.

Key Features

• Firm collet crimp that squeezes the case mouth into the bullet's crimp groove for consistent hold
• Improves accuracy by raising bullet-movement pressure threshold and stabilizing the pressure curve
• Works on bullets with or without a dedicated crimp groove
• Compatible with all 7/8"-14 reloading presses
• Reduces velocity variation for tighter, more predictable loads

Specifications

Frequently Asked Questions

Will this die work with my Lee press?

Yes, the Lee 90840 fits all standard 7/8"-14 reloading presses, which includes the vast majority of Lee single-stage and turret models. Confirm your press uses the standard 7/8"-14 thread before ordering.

Do I need a shellholder to use this die?

Yes. The shellholder is not included with the die. You'll need the appropriate Lee shellholder for 7mm-08 Remington Magnum if you don't already own one.

Does this die replace my normal seating die?

No. The factory crimp die is a separate step used after you've sized and seated your bullets with your regular dies. You run the cartridge through the crimp die as a final step to apply a firm crimp.

Will a factory crimp die help my accuracy?

Lee's testing shows that a firm crimp improves accuracy by raising the pressure required to move the bullet, which creates a more uniform pressure curve and reduces velocity variation—factors that directly support tighter groups.