Our Cowboy dies are built to slightly different dimensions than our regular dies to allow optimum sizing, expanding, seating and crimping needed to load great lead bullet ammo. In keeping with the spirit of the game, Cowboy dies even look different. Instead of the satin steel finish on the other RCBS dies, Cowboy dies have a "case-hardened" look. Handsome brass lock rings complete the picture, and even the packaging reflects the Cowboy theme.