Adjust the die body down over the case until you feel the crimp ledge hit the case, then adjust the die body up so there is no contact. Then set the die ring and screw the seater stem up or down to get your targeted OAL. 1.265 in this case. As always, there will be a little variance. I try for OALs that fall in between 1.260 and 1.265 with a RN in .45 ACP.
Then when you have the seater stem real close, adjust the stem way up out of the way and then adjust the die body down a hair at a time until you have the crimp you need. Just remove the bell or a hair more. Too many people over crimp auto calibers. Remember, case lengths vary, so you want the die to remove the bell entirely on the short cases, while the longer cases will get a slight inward crimp. .001 or maybe a hair more.
Lock the ring down and turn the seater stem down to touch the top of the bullet in the loaded round. Then turn the stem down 1/8 turn more.
Then seat/crimp a bullet and see what you have. If it falls in range, and the crimp is OK, try another, and another. If you get through several and everything is OK, your done. If not, tweak a hair to adjust the crimp or seating depth, remembering that they affect each other. If the crimp is good and you only have to adjust the seating depth a little it's easy. If you have to adjust the crimp a little by moving the die body, you will have to readjust the seater stem as well.
The case head should be at least flush, to under the barrel hood. Headspace is determined by the chamber and the case length. Don't worry about it. We are just looking for a seating depth that does not interfere with chambering.
The "plunk" test.
http://www.thehighroad.org/showthread.php?t=506678