Lee Short and Long Charging Dies are included in this kit for use with the Auto-Disk, Pro Auto-Disk and Auto-Drum Powder Measure. The rifle charging dies work the same as the pistol powder through expanding die, except it doesn't expand the case mouth. Rifle case expansion is done in the sizing die. The long die is used to charge small capacity rifle cases ranging from 22 caliber to 30 caliber with a minimum case length of 1.403" to a maximum case length of 2.015" (Ex: 22 Hornet to the 308 Winchester) using the Auto-Disk Powder Measure. The Lee Short Charging Die is for use with the Lee Auto-Disk, Pro Auto-Disk and Auto-Drum Powder Measure. Designed to work with cases .860 to 1.760 inches long (22 Hornet to 223 Rem), and bullet diameter .223 and larger due to powder bridging.