Everybody has their opinion and there are different ways to do it. I’ve tried measuring my chambers using the trimmed index card approach but that didn’t work well for me. It sounds like you’re satisfied with your result and I wouldn’t over think it.
But have your barrels inspected and the wall thickness measured by a knowledgeable gunsmith who is familiar with these old doubles. We don’t know if your chambers were lengthened after leaving the factory and if the wall thickness was compromised.
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