65MOA circle transcribes about 5' at 100yds. Basically, up to 100yds, put the BG in the circle and bang and you hit them. Maybe not an effective one, but for most closer-up work, that 65MOA circle is a nice outer-perimeter. Easier to pick up under stress than JUST a 2MOA dot. While allowing you the "accuracy" of a 2MOA (versus 5 or 10MOA) dot that won't completely cover items or mammals you might be shooting at.