like to see the test done with a Lee collet neck die. Ordinary neck dies can pull the neck off center when the expander is pulled through. Adding a collet die to your test would compare it to both full-length and regular neck sizing.
Hey, you've got all the time and money right? Get it done!
Still happily answering to the call-sign Peetza.
You do not HAVE a soul. You ARE a soul. You HAVE a body.
He is no fool who gives what he can not keep to gain what he can not lose.
-Jim Eliott, paraphrasing Philip Henry.