Stan
More people should test more loads that differ by ballistics. I think a lot of people generally have a ballistic load they like and if they try varying loads to move the patterns they choose different brands of the same general load. There is no reason to believe the dynamics of a double shotgun are different than a double rifle. When trying to regulate a double rifle, the general method is to vary velocity and bullet weight slowly to do away with crossing point of impact. A load of shot is basically a bullet until it leaves the barrel, and will impart a varying recoil effect on the right vs left barrel depending on the recoil level of the shot. There is an effect also on vertical placement, but it is the same for both barrels and it seems, at least to me, that it is not as pronounced as the horizontal effect. That is due I think to the gun having more resistance to movement vertically due to the nature of how it is held.
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