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Old June 7, 2012, 01:11 PM   #6
zippy13
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Join Date: August 23, 2008
Location: SoCal
Posts: 6,391
The geometry of an O/U gives the lower barrel less eccentricity about the neutral axis, so it will tend to rise less under recoil. Because of that, most folks shoot the lower barrel first and typically have the more constricted choke in the top barrel. That being said, there are exceptions: My trap combo is locked to shoot the upper barrel first because that is the barrel used when the single barrel is put in the same action.
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