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Old January 29, 2018, 09:13 PM   #15
BillM
Senior Member
 
Join Date: January 20, 2009
Location: Amity Oregon
Posts: 667
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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