Maybe that is why we often do better with O/U's. We use faster loads. I may use a low pressure load traveling at near 1100 fps in my old SxS's whereas for an O/U I might use a shell going at 1250 fps. At 40 yards the diffence in speed would account for an 8" or so diffence (not doing the calculation). That is not a small distance. Since most shooters miss behind...........You figure the rest out.

So many guns, so little time!