The Army usually zeros there's out to 300 m while the Marines zero there's out to 700 m. This guys is a country boy from Alabama and probably has worked it up for a long range zero, say 500-700 m plus.
A three hundred yard zero is very close to mechanical zero. A 700 yard zero, obviously, less so.
What I was getting at is there aren't enough "clicks" on a Leupold scope to compensate for such a distant shot, and even if it did that many clicks would put the scope at its least accurate setting. That means the sniper had to "hold over," that is, estimate how far below the crosshairs he needed to sight to make his shot.