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Discussion Starter · #1 ·
Discussion at the club today and wondering if someone would know the I.D. of a Beretta 12 ga 390 barrel (mobile choke style)? Some claimed it is significantly tighter the std US 12 ga bore range (not overbore/invec plus etc).
regards
Bob
 

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Discussion Starter · #4 ·
Gentlemen---thank you--one local party says .721 std so --.721 to .725 sounds good--now I have to consider how my measured American choke tubes fit in this equation.
regards
Bob
 

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^^^Yes, this is 1000% correct...the bore diameter is stamped on the bottom of the barrel in millimeters...example would be 18.4. You can convert the millimeter measure to thousands (of inches) with a google search for the calculator...easy peasy.
 
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