Shell Length
The current SAAMI spec for shotshells is attached. Note that max uncrimped length is
2.76 - .100 or 2.66 inches which is 2 5/8 if you use a ruler as Bruce shows. Minimum length is 2 .5 inches.
Parker catalogs indicate that the customer could specify chamber length and Winchester catalogs through 1910, and perhaps later allow the customer to select shell length when ordered in case lots.
The current Parker Pages shows methods of measuring chamber length; a blade type chamber gauge is "fail safe"; it will measure a tight chamber as a short chamber.
If there is a transition, it probably coincided with the change to Remington management discontinuing the availability of a chamber of the customer's choice.
Best, Austin
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Threaded Mode