Be careful about crimping, can lead to boom.
Put a case in the shell holder, run the piston up, screw the die in (seater backed out) until it makes light contact with the case, lower the piston and check to see if you have removed the bell, if so put another belled case in with a projectile sitting in the case mouth and drive it into the die and start screwing in the seater die until you make contact, keep on screwing it in util you have reached the proper oal.
Or watch this.
http://youtu.be/S8EMk4Hs40U