Lee Precision 7mm RUM Factory Crimp Rifle Die

The Lee Precision 90869 Factory Crimp Die for 7mm STW and 7mm RUM applies a crimp that holds the bullet more securely than standard crimping methods. Testing shows that even bullets without a crimp groove will deliver improved accuracy when crimped with this die. A firm crimp raises the pressure threshold before bullet movement occurs, which creates a more consistent pressure curve and reduces velocity variation.