You have to let the gun recoil while being held in your hands to get accurate patterning. The gun recoils up and right and left before the shot leaves the barrels. All this was accounted for when they were made. They won't be regulated as well as a double rifle or an English best gun but they should be pretty good. Although I'm sure a few stinkers got through occasionally. And velocity and payload weight will change POI.
This applies to rifles too. Hold them how they'll be shot when sighting in. Shooting sticks, not holding the forend or fastening them to a lead sled changes POI.
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