First of all ....you're not "patterning" ....you're determining Point of Impact....to see where it hits vs where you look.
When you check the POI ....you put a say 3" dot on the pattern board...and screw in a mod of Full choke...so you can see where the center of the pattern hits.... this Point of Aim concept makes no sense....what is the Point of Aim vs Point of Impact at the pattern board.....does the gun hit where you look or not....
does it hit the same as the top barrel....
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