Daniel, that is not an acceptable method of measuring chamber depth. A precision bore and chamber mic is the very best way. Short of that you can use something like Galazan's brass multi-gauge chamber depth gage.
See Page 41 in this catalog.
https://issuu.com/galazan/docs/galazan_catalog_9
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__________________
"I'm a Setter man.
Not because I think they're better than the other breeds,
but because I'm a romantic - stuck on tradition - and to me, a Setter just "belongs" in the grouse picture."
George King, "That's Ruff", 2010 - a timeless classic.
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