Lee Precision 90839 Factory Crimp Die 7x57mm Mauser

The Lee Precision Factory Crimp Die for 7x57mm Mauser is a specialized reloading die built to deliver that factory-fresh performance every single time you chamber a round. If you're hand-loading 7x57mm Mauser ammunition, this crimp die does double duty: it post-sizes your rifle cartridges while simultaneously applying a precise crimp, ensuring consistent fit and reliable feeding just like commercial factory ammo. Whether you're preparing hunting rounds or precision range loads, this tool takes the guesswork out of the final step of the reloading process.

The carbide sizer at the heart of this die is engineered to handle a wide range of bullet types, including jacketed varieties that might otherwise resist crimping. That versatility means you're not locked into a single bullet choice—reload what works best for your 7x57mm rifle. The crimp adjustment screw lets you dial in exactly the amount of crimp you need, giving you control without forcing you into a one-size-fits-all approach. Even bullets without a cannelure (the groove that usually helps a crimp take hold) will seat securely, so you can work with the ammunition that suits your hunting or shooting goals.

Lee Precision designed this die to simplify the reloading workflow: you set your crimp depth once, then every round that passes through receives the same consistent compression. That repeatability translates to more predictable velocities, tighter groups, and ammunition that chambers as smoothly as factory loads. For 7x57mm Mauser reloaders who refuse to compromise on quality, this factory crimp die is an essential addition to your press.

Key Features

• Carbide sizer post-sizes cartridges while crimping in one step
• Accommodates a wide variety of jacketed bullet types
• Adjustable crimp screw for precise, repeatable results
• Crimps bullets without cannelures effectively
• Engineered to deliver factory-grade consistency and chamber fit

Specifications

Frequently Asked Questions

What does a factory crimp die do?

A factory crimp die sizes your cartridge and applies a crimp simultaneously, ensuring consistent bullet seating and chamber fit. This step helps tighten velocity spreads and improves reliability, mimicking the quality control of factory ammunition.

Can I use this die with any bullet type?

The Lee Factory Crimp Die is designed to work with a wide range of jacketed bullets, even those without a cannelure. You have flexibility in your bullet selection without sacrificing crimp performance.

Do I need additional equipment to use this crimp die?

This is a reloading die; you'll need a compatible reloading press to operate it. The crimp adjustment screw lets you set your desired crimp depth once the die is mounted.