For what it’s worth Keith - done correctly both the Gritters and between centers methods align at the end of the chamber (or should)...
The difference is what the 2nd point of the alignment is - the far end muzzle hole, or down the throat further so you have axial bore alignment.
Of course precision measuring / dialing in methods matters in both - and is really the big differentiator on how well axially aligned you end up with the 2 centers or bore at throat alignment.
Mickey thought Gordy was a Good smith and knew what he was doing, so there was some respect there... I know that because I asked him that once myself.
Mickey was a classy guy... I miss him.
