I have not noted, measured, nor experienced any difference in my 20ga or .410 sxs guns for POI vs drop when compared to my 12ga sxs (or even O/U and auto) guns.
I do recall a few yrs back, a friend bought a used Grulla 28g once and it shot noticably high for him and me. I looked it over and noted that the barrels had a noticable curve upward. It was very subtle but it was there. He sold the gun right away. Me? I would have bent the barrels back straight, as I have done this since then on a damaged barrel set.
