Welcome to the new PGCA Forum! As well, since it
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What you will need is called a bore micrometer Jason and if you search this forum or the net you might find one for a reasonable price. If not find a local gunshop or gunsmith who might have one that could measure it for you. If you post where you live maybe one of our members could help you out.
If you get into these old doubles you will find a use for one.
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