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Old August 13, 2011, 09:53 AM   #6
oneounceload
Junior member
 
Join Date: April 18, 2008
Location: N. Central Florida
Posts: 8,518
Your gunsmith should have barrel calipers - as mentioned, you need to know bore diameter, and the correct tools will tell you that in 5 seconds. What it says matters not when compared to what it actually does - as also mentioned above, get ye to thy pattern board

IF your constriction is .012, that is nominal IC designation
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