Before resizing, case neck diameter - Range: 0.3810 to 0.3850
After full length resizing - Range: 0.3730 to 0.3740
After case mouth expansion - Range: 0.3760 to 0.3790
After bullet is seated, without any crimp - Range: 0.3760 to 0.3785
Those numbers are very close to what I am getting. I am using a Dillon 650 and have the RCBS competition seating die and the Lee Factory Crimp die. If you want to get really tight specs, sort your brass by head stamp and get the competition seating die. The difference on OAL will shrink to + - .003. That is less than half the diameter of a human hair. For what we do it makes little difference. Most say + - .005 is well within functional specs. My crimp is .377 and the Lee barely touches the brass.
Yes, I overthink this too, but I like it.