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If the OP meant caliber instead of gauge it could be 38 extra long rimfire. Not
much else out there that's 2" OAL.
There is 58-60-500 rimfire from the 1865 first Allin conversion---or possibly the
OP has a inside primed 45-70 or 50-70 and thinks it's rimfire because no centerfire
primer is visible?
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