Barrel wall thickness at the points Randy indicated would be my primary concern to know before shooting any of these old guns with any load. A lot can and often does happen to them in a hundred years or more.
A $100 Manson gauge is a great investment if you can't find anyone nearby that is qualified to make the measurements for you. Lots of info on the site on the best way to use one. Best investment for safety and peace of mind IMHO.
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