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Barrel Markings: M2, 1977, 1:22, 45 70
The barrel width is 1 1/8" - Length 30"
Tag info: Twist 1-22, Patch .008, Groove dia .457, Ball size .437, Conical .450, Black Powder 70GR
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I suggested the current owner put the rifle for sale and it appears he did. This site has several pictures of the gun which look pretty good.
John
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Looks like he built a bench slug gun. ball size would be for the ball and patch and the conical would be for a paper patched. 70G of black probably FFF is pretty light for a bench gun but it may shoot best with that load.