Unclenick's comments are excellent.
andrewst35 tells us:
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I used the one with the larger hole and shorter of the two. It read 1 line above 0.
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I believe your case headspace would then be 1.631 inch. As new fired case headspace with the .308 are typically 1 to 2 thousandths shorter than chamber headspace, I'd guess your chamber's actual headspace is between 1.632 and 1.633 inch; right in the middle of SAAMI specs.