Doc Drew probably has the real answer. Most U.S. makers used imported tubes both composite iron and steel and fluid steel up until The Great War. Most from Belgium and France, but actual brand name barrels like Krupp and Whitworth from Germany and England. Tubes were also supplied in the U.S. by Sanderson Bros. & Co. which became part of Crucible Steel. Remington advertised that they made their Remington Steel barrels but I've never seen them state where their Ordnance Steel barrels came from, just how strong they were.
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