The RCBS Pistol Powder Expanders are designed to work with the RCBS Uniflow Case Activated Linkage Kit to give progressive pistol cartridge reloaders back a valuable station on their reloading press. Adding bullet feeders to progressive reloading presses helps to increase efficiency, but will cost a valuable station in the reloading process. By adding this powder expander to the Uniflow Case Activated Linkage Kit (sold Separately) case mouth expanding and powder charging can be completed in one station freeing up that valuable reloading press real estate.