According to Ronald S. Gabriel's "American & British 410 Shotguns", L.C. Smith .410's were first put in production in 1926....Winchester created the 3" .410 shell in 1933 with the introduction of the Winchester model 42 which is credited as the first American shotgun chambered for the 3" shell. I could not find when L.C. Smith began chambering their guns for the 3" shell, but it had to be after Winchester developed it. I have no doubt some Elsie .410's were returned to the factory for chamber lengthening to 3".
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