Install it into the handle, select several of your empty, and unprimed brass and set the depth to match the deepest primer pocket. Odds are they will be very close in depth anyways, but you get the idea. Once set, twist it a few times in each primer pocket until it spins smoothly. Most will spin easily, occasionally some will have a little resistance and first and will ease up as it does its job. Practice make perfect. Military brass with the crimped primer will take more effort. You may want to set the depth to a commercial case and use that measurment for the military brass.