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Old February 27, 2012, 01:20 PM   #2
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Join Date: August 6, 2009
Location: Albuquerque
Posts: 2,401
On modern shells not only no, but hell no. This looks like pre-WWI vintage with the Prussia mark, and most likely is chambered in 10/65. Longer chamberings were typically indicated with a length stamp, so just 12 indicated 12/65 and 12/70 was specifically marked.
F 135 - the right choice
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