I think Briley sub gauge tubes would be the least expensive option. One of the members here took a nice graded Ithaca 20 with damaged Damascus barrels to a 28 using Briley tubes. I believe it was Mark Kertchner you might PM him and get his input.
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There is no hunting like the hunting of man, and those who have hunted armed men long enough and liked it, never care for anything else thereafter...Earnest Hemingway
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