The Hornady Cowboy Custom Grade Expander Die improves the speed and ease with which reloads can be performed, thanks to this one added step that minimizes any kinks in the handloading process. The Hornady Cowboy Custom Grade Expander Die works by widening the mouth of the cartridge-case mouth in order to facilitate easier insertion of loose powder and bullets before crimping the case shut. Expander die only works on straight-walled cases Features precision machining for smooth surface Offers easy adjustments Like all of Hornady's reloading dies, the Hornady Cowboy Custom Grade Expander Die is built to hardy specifications, so Hornady ensures that this too Mfg: Hornady