Thanks Jack, 4% it is. And David, the serial # is 13814. It is 10 ga. I looked it up. It was made in 1879. I'm pretty sure you can't use modern day ammo. I'm guessing that FFF black powder is what I should use. I used to be an avid black powder flintlock shooter back in the mid 1970s & still have a partial can. Most people I talk with say just use it as a wall hanger. I would bench test it first but still I would hate to see it blown apart.
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