Dave,
Thanks. I thought it would have been in the 1920s after Western cartridge came out with the Super-X shell. I found a reference to the Model-12 using 2 3/4" chambers as standard around 1927.
Does it seem reasonable that a gun made in 1917 would have originally had a 2 3/4" chamber? I'm not sure if a research letter would provide the chamber length.
Thanks
Ken
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