In setting up my rifles, I have noticed that there is a slight "range" of headspace you have to work with. For example, I usually place the Go guage in the chamber, and screw the barrel up to it. Next I insert the No Go guage, and adjust so the bolt will not close on it. Here's the "range" I mentioned. Do you make it so the bolt will barel start down from full open, or so it just will barely NOT close?

The reason I ask, is it seems sometimes the rifles are not as accurate as they were before. Even with the same load. Repeatability would be much nicer.