BigBill, I've built a few rifles before, so I'm not quite a stranger to the headspacing and the proper use of the guages to do this, nor am I an expert. I too have worked in maching industry and worked in microns but never as close as 1/1,000,000,000th. I've got the barrel vise and action wrench but would have to buy the proper head . Probably have a good friend who has an up and running gunsmith shop(his business) install the barrel and headspace it while at the shop.
How did you get your new barrel on, with a pipe wrench, without marring it? Also, don't think I'd use any heat on something like this? Maybe a 3' cheater pipe on the handle of the action wrench.