The Pow'r Punch Decapping Rod is for use with handgun calibers in Progressive Presses. The decapping rod has a special spring loaded decapping pin to ensure the spent primer is always fully ejected from the primer pocket. Eliminates spent primers hanging up in bottom of the primer pocket and jamming your progressive press. Works in all RCBS handgun dies except Cowboy Dies. RCBS handgun dies with Pow'r Punch Decapping Rod Assembly will work in any brand progressive reloading press. Notes:Spring-loaded decapping pin for decapping brass with military primersLarger diameter rod than standard270 caliber through 45 caliber only