Lee 257 Roberts & 257 Ackley Improved Factory Crimp Die. The higher start pressure insures a more uniform pressure curve and less velocity variation. Even powder selection is less critical. This die is included at no extra charge with Lee pacesetter dies. Specifications for Lee Gunsmith And Reloading Equipment 90835: Manufacturer: Lee Caliber: .257 Roberts Additional Features: Factory Crimp Rifle Die Fabric/Material: Carbide Gun Type: Rifle Package Contents: Lee Gunsmith And Reloading Equipment 90835 The Lee Factory Crimp Rifle Die For 257 Roberts 90835 is a quality addition to the Lee Precision lineup. For more great deals on Rifle Reloading Dies by Lee Precision please browse our Lee Reloading Equipment page. Lee Gunsmith And Reloading Equipment 90835