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I believe chambers are 2 1/2".
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Very likely the chambers are 2 5/8-inch intended for 2 3/4-inch shells. The only two A.H. Fox Gun Co. catalogs that discuss chamber lengths are the large grey 1913 and 1914 "A FOX GETS THE GAME" catalogs --
1914 A FOX GETS THE GAME.jpg
1914 Chamber Length & Ammunition Suggestions.jpg
They state the 12-gauge guns are regularly chambered for 2 3/4-inch shells, 16-gauge for 2 9/16-inch shells and 20-gauge for 2 1/2-inch shells.