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Coldsteel - I think you will find that gun (beautiful, btw) to be regulated for conicals. This conclusion is due to the sight arangement. Had it only the leaf sights, then I'd say, probably round ball. The addition of the ladder sight pretty much shows this double to be regulated for conicals. Now, I'd go ahead with testing using round ball though, due to the twist rates.
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I am not sure the sights are definitive as a indicator of the conical, though it could be so.
George in English Guns & Rifles talks about round ball rifles of larger bores with all sorts of long range sights.
But the sight is pretty high for the round ball. As a barrel sight it would likely shoot to 600+ yards with that much elevation.

I wonder if the bores are slightly relieved at the muzzle and thus show a sharper edge than they might otherwise?

Dan

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