Tough Shot 2: Far, Far Away
In open country, if you intrude into a big buck's universe, he will vanish. So your best chance of putting him in your freezer is to shoot from another solar system where his hyperdeveloped sense of survival doesn't operate, and plan the shot in advance.

First, figure out where your future trophy exposes himself, then pick a spot downwind 300 yards away where you'll have an unobstructed shot. Be in place an hour before the deer is. Get into a steady rest. You should know in advance where you'll hold. Big bucks do not dawdle, and you'll have only a second or two in which to shoot, so don't hesitate.