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Looking at that action, I cannot help but think this once used to be a supine match rifle chambered in something like .461 Gibbs. How about it, to recreate something like that?
FWIW, Ueli Eichelberger in Switzerland still will make you a (early pattern,with gain twist if you want, but not segmental rifling) Metford-rifled barrel, and good work too... I have one of his barrels on my #2 Musket, and it really is a quality barrel, very accurate and cleans easily. When compared to my .45 Snover with (yes!) Metford segmental rifling, I do have to say it is better. But the Snover is much better with PP bullets though.

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Arthur Smith of colchester can do a segmnented metford rifling...even gaintwist...and London proof marked. Yes...the barrels are profiled and chambered.