LEE 5.7x28 FN Short Bottle Neck Collet Style Factory Crimp Die Silver. 7x28 FN Factory Crimp Die crimps the bullet firmly in place. 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 5.7x28 FN Short Bottle Neck Collet Style Factory Crimp Die: Manufacturer: Lee Caliber: 5.7x28mm Gun Type: Pistol Package Contents: LEE 5.7x28 FN Short Bottle Neck Collet Style Factory Crimp Die The LEE 5.7x28 FN Short Bottle Neck Collet Style Factory Crimp Die is a quality addition to the Lee Precision lineup. For more great deals on Pistol Reloading Dies by Lee Precision please browse our Lee Reloading Equipment page. LEE 90725: 5.7x28 FN Short Bottle Neck Collet Style Factory Crimp Die Silver