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That's a beautiful double!

Does it have Henry rifling? I have a Grant double which has Alex Henry barrels and action, but was stocked and finished by Grant.

I wonder if your gun has a similar ancestry?

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5 groove standard type rifling; guessing in that period it would have been called "Baker" type rifling?
The closeup does make the bore look much worse than it really is. Shoots quite nicely.
- Mike