Thread: lanber 2004
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Old March 1, 2011, 10:19 AM   #4
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Join Date: April 18, 2008
Location: N. Central Florida
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If they are using the Perazzi style numbering system, it would seem that
0 is Cylinder or .000 constriction
3 would be IC or about .012 constriction
5 would be Modified or about .020 constriction
7 would be IM, or about .028 constriction
10 would be Full or about .040 constriction

They are the most likely combination, as European guns typically come with those chokes. In England, IC is also called 1/4, Modofied is called 1/2, IM is called 3/4.

They are the constrictions typically measured in groups of 4MM's.
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