Thirteen yards is the standard distance for determining POI. Fourteen will do. The trick is to maintain the same bead/rib sight picture you would use in normal shooting.
What clouds the issue is how much daylight you put between the front sight and the bird. Or maybe you put the bead on the target? When you talk around, it is difficult to know what sight picture the other guy was using, what his reference point is.
Just a causal observation, but I would offer that most field guns will print about 3" high at this distance. Does that sound right to the rest of you?
As to the pattern, you really need to move it back to the standard 40 yds. It's just the conventional yardstick for patterning.
Individual patterns vary all over the place, and if you shoot a small number you may not be able to tell they even came from the same gun. Shooting a single pattern can be pretty discouraging and misleading if you get an abnormal pattern.
