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Can someone please give me the dimensions of the barrel shank on a Trapdoor?
I know it's supposed to be in the book "Single shot rifles and actions", but I haven't got the book and although it's also available online, there seems to be a geographical block preventing me reading it here in Mauserland.
Thread is 10 square threads per inch, Barrel shank length 1.433 inches with 0.875 inches threaded, Major thread diameter 0.900 inches, minor diameter 0.850 inches - barrel diameter nominal 1.0 inches
Many thanks! I wonder, why was there a fashion for square threads in the 19th C., as they are a PITA to cut, especially internally?
My guess would be that they may have been considered to be stronger.