What doesn't make sense about the difference in 4 square inches of kill zone and 36 square inches of kill zone? I believe that totals about roughly 32 sq. inches of more kill zone! It means that if you miss the "smaller" zone by an inch or so in any direction, you have a horribly wounded animal that you'll never find, AND IF you were aiming for the center of the vitals, the deer would be dead 0-100 yards away!