RCBS 3 Die Roll Crimp Set for popular straight wall pistol cartridges. The die set features a steel Sizer Die, Expander Die and Roll Crimp Seat Die. The cases must be lubricated for use with the steel Sizer Die. The expander Die expands the case to the proper diameter to accept the bullet. The Seat Die seats the bullet in the cartridge case and 'roll' crimps the case to eliminate movement during recoil.
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