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IMO, what you want/need is a thick "Chunk Gun" barrel - most of which are custom-made by small, independent barrel makers.
Search for Bob Hoyt, Wayne Jenkins, Charlie Burton, Paul Griffith, as well as Ed Rayl - all can make chunk gun barrels.
IIRC, all of these guys can do a 48" barrel.
Bob made a 1-1/4"X 42" a few years ago; one made a bbl 60" long by 1-3/8" across-the-flats.
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