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Old January 26, 2010, 09:24 AM   #8
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Join Date: April 18, 2008
Location: N. Central Florida
Posts: 8,518
A 3" chambered barrel will have a "70" mark, while shorter chambers will have marks like "67" or "65", besides the gauge marking.
Just for clarification, a 3" chamber will be marked 76, a 2-3/4 is marked 70mm.

The 18,5 is the diameter in mm of the bore. Other markings will be from the proof house of the origin country along with the proof pressure tested in metric designations
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