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Brian, the third headspace measurement is the one from the head to the reference point on a headspace gauge.
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Bart B., the one and only head space measurement is from the shoulder/datum to the bolt face. Problem with the head space gage, it has a fixed length for all with an exemption, me, I am not so hard headed as to insist on just a go-gage or a no go-gage or a field reject gage. I make gages from .012" shorter than minimum length to .018" longer than a minimum length case. That is 30 gages separated by .001".
Then there is verifying, verify the head space gage, verify the Wilson case gage, verify the length of the case from the shoulder/datum to the head of the case, verify the sizing die.
Then there is the chamber. I measure the length of the chamber in thousandths from the shoulder to the bolt face. I know there are rims, there are belts, when it comes to reducing all that case travel, I measure from the shoulder to the bolt face.
F. Guffey