Lees 40 S&W Pistol Breech Lock 3-Die Set includes colored Smart Lock bushings for easy die identification, Carbide Full Length Sizing Die, Bullet Seating Die, Powder Thru Expanding Die, Universal Shell Holder, Powder Dipper and Instructions/Load Data. This can be used to load the 10mm Auto. Back out the bullet seating die and powder through expanding die 1 3/4 turns. 10mm Load Data is found in Modern Reloading. This can also be used to reload the 41 Action Express. The powder through expander and bullet seating die would have to be backed out approximately two turns. The load data included with the dies cannot be used with the 41 Action Express, it would have to be obtained through a favorite powder manufacturer. WARNING: DO NOT USE reloads in Glock or similar guns with chambers that do not fully support the cartridge due to the intrusion of the feed ramp.