I was wondering if I could determine if my 2A1 passses the 7.62 Nato max of 1.645 without buying the gauge. I did the fired shell with spent primer trick (You can see the length in the picture) but need to know how to measure for the headspace with this measurement on this rifle? I have a Forster field gauge of 1.638. Can I determine the headspace with these two lengths? Close bolt on field gauge and insert feeler gauge between rear lug and receiver? Or is this going to be too hard to determine?

This rifle is in near new shape with mirror bright bore and clean chamber. All matching except nose cap. It swallowed up a Forster field gauge, which I figured it would. Since I don't plan on putting thousands of rounds down range, I was hoping to save a buck without spending $30 for a one time use gauge. I don't want to assume it passes without checking.
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