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Old June 6, 2022, 07:27 PM   #6
44 AMP
Join Date: March 11, 2006
Location: Upper US
Posts: 26,141
Double rifles are regulated so that each barrel's bullet strikes within "x" amount of distance from the point of aim at a given range.

With double shotguns, the principle still holds, but it is the center of the pattern that matters. And, where that center is, relative to the bead (your sight) at a given range.

Call it regulated, or call it aligned, when the sight (blade or bead) is offset from barrel centerline, the barrels need to be aligned so that the bullet or center of the pattern strikes as close to where the sight indicates as practical. side to side AND vertical.

getting two shotgun barrels to shoot to the same place is easier (needing less work) to achieve than with rifle barrels, due to patterns vs single bullets, but it still needs to be done.
All else being equal (and it almost never is) bigger bullets tend to work better.
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