I have an 870 SM with a red dot on it and have it set up for 3" #6 and 3 1/2" #7 Hevi shot out to 40 yards. Today at the Learn to Hunt sight in with kids, we were given a box of #5 Hevi Shot to shoot. They were 3" rounds. At 20 yards, I was about 3" hit with my point of impact from where I aimed. I ususally aim on a turkey where the feathers meet the color of the head. I am good to go or would you move the sight a little and try again? I did not get a chance to shoot at 40 with this load. Like I mentioned, it is dead on at 40 yards.