Lee 90854 Factory Crimp Rifle Die 44-40 Winchester

The Lee Precision Factory Crimp Die for 44-40 Winchester is a specialized reloading tool designed to firm up your bullet seating for measurably better accuracy. Unlike standard seating dies, this crimp die works by squeezing the case mouth into the bullet's crimp groove—a method that delivers a more consistent hold than conventional crimping alone. The result: pressure builds more uniformly, velocity stays more consistent, and groups tighten downrange. Whether you're loading for a lever-action rifle or single-shot, this die pays dividends in precision.

The collet-based design is the key to its performance. It applies firm, even pressure across the case mouth, gripping the bullet securely without the inconsistencies that can creep in with looser crimps. Testing by Lee has shown that even bullets without a dedicated crimp groove shoot more accurately when properly crimped with this tool—a strong advantage if you're experimenting with unconventional bullets or pulling older stock.

Setup is straightforward: the die fits any 7/8"-14 reloading press, integrating seamlessly into your existing kit. Note that a shellholder is sold separately. Once in your die box, this tool becomes a go-to step for anyone serious about wringing consistent accuracy out of 44-40 loads.

Key Features

• Collet-based crimping mechanism for firm, uniform bullet seating
• Improves pressure curve consistency and reduces velocity variation
• Effective on bullets with or without crimp grooves
• Compatible with all 7/8"-14 reloading presses

Specifications

Frequently Asked Questions

Will this crimp die work in my reloading press?

Yes, if your press has 7/8"-14 threads. The Factory Crimp Die fits all standard reloading presses with that thread size. You'll need to purchase a shellholder separately if you don't already have one for 44-40 Winchester.

What's the difference between this and a standard seating die crimp?

The Factory Crimp Die uses a collet that squeezes the case mouth firmly into the bullet's crimp groove, creating a more consistent and stronger hold than a standard seating die's light crimp. This firmer crimp builds pressure more uniformly, resulting in less velocity variation and improved accuracy.

Does this die work only on bullets with crimp grooves?

No. While it's most effective on bullets designed with a crimp groove, Lee's testing shows that the Factory Crimp Die improves accuracy even on bullets without a dedicated crimp groove.

Is a shellholder included?

No, the shellholder is sold separately. You'll need to order the correct 44-40 Winchester shellholder to use with this die.