Lee Factory Crimp Die 7mm STW – Model 90869

Lee Factory Crimp Die for 7mm STW

The Lee Factory Crimp Die (Model 90869) represents a straightforward approach to one of reloading's most important steps: securing the bullet firmly in the case.

How It Works

This die crimps the bullet in place more firmly than conventional methods. Testing shows that even bullets without a crimp groove shoot more accurately when properly crimped. The reason is simple physics: a firm crimp requires pressure to build to a higher level before the bullet moves. This higher initial pressure creates a more uniform pressure curve throughout the firing cycle, resulting in less velocity variation from round to round.

Key Features

• Carbide sizer post-sizes rifle cartridges while crimping
• Guarantees every round chambers freely, just as factory ammunition does
• Accommodates a wide range of ammunition types, including jacketed bullets
• Powerful enough to crimp bullets without cannelures
• Simple adjustment screw to set desired crimp amount

Why Crimp?

A proper crimp improves accuracy by ensuring consistent pressure buildup. This translates to tighter groups and more predictable ballistics—especially important for precision shooting and hunting applications.

The Lee Factory Crimp Die is an essential tool for reloaders who demand consistency and reliability from their ammunition.