Lee Precision Factory Crimp Die 17 Hornet. Tests demonstrate that even bullets which have no crimp groove will shoot more accurately. A firm crimp improves accuracy because pressure must build to a higher level before the bullet begins to move. This higher start pressure insures a more uniform pressure curve and less velocity variation. Specifications for Lee Factory Crimp Die: Manufacturer: Lee Quantity: 1 Gun Type: Rifle Package Contents: Lee Factory Crimp Die Lee 90605 Factory Crimp Die 17 Hornet