I shot one rigged up like that at a local 3D shoot. It was less than twenty yards away. As luck would have it, I was the first in our group to shoot it. I aimed just in front of the shoulder and nailed him directly in the hip. It ain' t as easy as it looks.

I might would take a very close shot if the deer is at a slow walk. I would not try any kind of moving shot over twenty yards.