The 223 does not need to be crimped. Standard neck tension is sufficient (even desirable).
Soooo.....
1. With the seating die screwed out of the press (and seating stem also backed way off), put an empty/resized case in the press and run the ram up all the way.
2. Screw the seating die down until you feel it juuuuuust contact the case, then (w/ Lee) you can either just leave it there, or (suggested) back off at least 1/2 turn. Lock it down.
3. At this point fill the case w/ desired powder charge, run it up into the die, screw the seating stem down to seat bullet at desired OAL ... . and lock it down as well
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