Lee 90825 Factory Crimp Rifle Die 300 Winchester Magnum

The Lee 90825 Factory Crimp Die for 300 Winchester Magnum is a specialized reloading die designed to deliver the firm bullet crimp that separates consistent handloads from mediocre ones. Unlike standard seating dies that merely hold a bullet in the case, a factory crimp die uses a collet mechanism to squeeze the case mouth into the bullet's crimp groove with precision, creating a mechanical lock that keeps your projectile exactly where you seated it—shot after shot.

Why does crimp quality matter? Pressure. When a bullet isn't firmly crimped, it can move slightly forward as pressure builds in the chamber, throwing off your pressure curve and creating velocity variation that no amount of powder charge tweaking will fix. A proper crimp ensures pressure reaches the level you intended before bullet movement occurs, giving you the uniform velocities and tighter groups that precision reloading demands. Lee's collet design works on bullets with or without a crimp groove, giving you flexibility in your component selection.

This die fits all 7/8"-14 reloading presses, meaning if you're running a Lee progressive or single-stage press, or any other standard press on the market, you can integrate factory crimping into your 300 Winchester Magnum workflow. It's the kind of upgrade that costs little but pays dividends in consistency—especially valuable if you're pushing the magnum's velocity potential and need every round to perform identically. Note that a shellholder is sold separately.

Key Features

• Collet-style crimping mechanism for firm, consistent bullet seating
• Improves accuracy by creating uniform pressure curves and reducing velocity variation
• Works on bullets with or without crimp grooves
• Compatible with all 7/8"-14 reloading presses

Specifications

Frequently Asked Questions

Will this factory crimp die work with my Lee press?

Yes, as long as your press uses the standard 7/8"-14 thread. This includes all Lee single-stage and progressive presses, as well as most other major press brands.

Do I need a shellholder to use this die?

Yes, a shellholder is required but not included with the die. You'll need to purchase one separately that matches your 300 Winchester Magnum brass.

Can I use this die on bullets without a crimp groove?

Yes. Lee's collet design allows effective crimping on bullets regardless of whether they have a dedicated crimp groove, giving you more component flexibility.

How does factory crimping improve accuracy?

A firm crimp keeps the bullet locked in place, requiring pressure to build to a higher level before movement occurs. This creates a more uniform pressure curve and reduces velocity variation between shots, leading to tighter groups.