Lee 90953 Factory Crimp Pistol Die 50 Browning Machine

The Lee Precision Factory Crimp Die for .50 BMG delivers a firm, consistent crimp that goes beyond what standard seating dies can achieve. Built for the specialized reloader who demands precision with one of the largest rifle cartridges, this die uses a collet mechanism to squeeze the case mouth into the bullet's crimp groove with authority. The result is a more uniform pressure curve, reduced velocity variation, and measurably better accuracy—even with bullets that lack a traditional crimp groove.

If you're working up loads for a .50 BMG rifle or machine gun platform, you already know that consistency matters at this scale. A firm crimp prevents bullet movement before pressure builds, which stabilizes your ballistic curve downrange. This die fits any reloading press that accepts standard 7/8"-14 threaded dies, making it a straightforward addition to your .50 BMG setup once you have the correct shellholder on hand.

Lee's Factory Crimp Die is purpose-built for shooters serious about precision rifle reloading. Whether you're preparing match ammunition or working to maximize accuracy from a specialty big-bore rifle, this die addresses one of the most overlooked variables in the handloading process: the quality and uniformity of the crimp itself.

Key Features

• Collet-style crimping mechanism for firm, consistent bullet hold
• Improves accuracy by stabilizing pressure curve and reducing velocity variation
• Works with bullets both with and without crimp grooves
• Fits all standard 7/8"-14 threaded reloading presses

Specifications

Frequently Asked Questions

What presses does this die work with?

The Lee Precision Factory Crimp Die fits any reloading press that accepts standard 7/8"-14 threaded dies, which covers the vast majority of single-stage and progressive presses on the market.

Do I need a special shellholder?

Yes, you'll need the appropriate shellholder for .50 BMG, which is sold separately. The die itself does not include a shellholder.

Does this die work with bullets that don't have a crimp groove?

Yes. Testing shows that the Lee Factory Crimp Die crimps bullets firmly in place regardless of whether they have a dedicated crimp groove, and accuracy improves even in those cases.

How does a factory crimp die improve accuracy?

A firm crimp prevents the bullet from moving forward as pressure builds in the chamber, which ensures pressure reaches a consistent peak level. This more uniform pressure curve results in reduced velocity variation and tighter group accuracy.