For me personally that isn't a good pattern. I want a hot core and that means tight up close. Thats where optics come into play. I run a red dot on most all my turkey guns. If it doesn't have a dot, I tailor my pattern and limit my shot distance. If thats your 40 yard pattern, I'd see what it looks like at 30 and keep your distance to that.
Also like others have said, you need to shoot a larger piece of paper and see what the overall pattern looks like. You could be on the fringe of your pattern and not even notice it. Believe it or not a good bit of shotguns won't shoot poa/poi. Thats another area optics come into play.
This is a 20ga at 40 yards thats still a little too open to me if that tells you what size I like my patterns.