Lee 444 Marlin Factory Crimp Die

444 Marlin Factory Crimp Die by LEE RELOADING PRODUCTSLee Factory Crimp Dies crimp the bullet in place more firmly than any other tool. 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.