I see this a little differently..... I don't use "two points in the chamber" but instead I run the section of barrel 1" behind the leade and 2-4" in...
I think I'd have to crown it first, find bore center line and turn the outside to match to give me an indexing point. Then of course I would jack it...
I have seen a couple steadies as Dave has mentioned. It is probably a minor measurement, but how close can the muzzle be in the 4 jaw? Are you going...
Louis. you've described the standard method of chambering around here..... ie to align muzzle and throat. 99.9% of all accuracy-minded and Bench Rest...