Lee 40 S&W | 10mm Auto Pistol Breech Lock 4-Die Set includes colored Smart Lock bushings for easy die identification, Carbide Full Length Sizing Die, Bullet Seating Die, Powder Thru Expanding Die, Carbide Factory Crimp Die, Universal Shell Holder, Powder Dipper and Instructions/Load Data. Note: can be used to load the 10mm Auto. Back out the bullet seating die and powder through expanding die 1 3/4 turns. 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 can not be used with the 41 Action Express, it would have to be obtained through one of your favorite powder manufacturers.