What about Sharps Rifles? They had all kinds of weird large calibers, and were made in the 19th Century. Are there exceptions for those?
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U.Kdt.Hdb B. I. 28) This possibility of using the hydrophone to help in detecting surface ships should, however, be restricted to those cases where the submarine is unavoidably compelled to stay below the surface.
http://www.hackworth.com/
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