serpico1985;
The headspace is set when the barrel extension is screwed onto the barrel, not when the barrel is installed in the receiver.
Any "settling in" that happens when the rifle is fired is simply the tooling marks on the bolt and barrel extension being hammered together/peened smoother due to case pressure and the rubbing of unlocking.
Unless the machinists involved were drunk or incompetent, those toolmarks will be less than tenth of a thousandth. If you had a rack of headspace gauges, each half-a-thou apart, you might (might) be able to measure the change.


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