In all fairness, some people, especially those who use the instinctive method, tend to shoot better on certain kinds of targets than they do on others. A one spot is hard to focus on for some people. Instinctive shooting is all about the eye triggering the shot, and if the focus is weak or not there at all, the result will be less than spectacular. Some days, the small shot-out hole in the center of my bag is lit-up by the sun, while all else is in shadow. I can knock the middle out at those times, even from forty yards. Other times, the whole bag is lit, or shadowed, and the hole (which I use for my aiming point) is vague. My groups tend to be bigger then.