Here is my pattern at 42 yards (measured w/ rangefinder) in a 10" circle.
My gun is 28" mossberg 835 with a comp-n-choke xx-full (.680) using fedral grand slam 3.5" 2oz #5 shot. 170 in a 10" circle but some holes that more than one were touching were only counted once so actually probably 190 in a 10" circle. This is with the barrel fully polished. The weather was overcast and almost no wind.