In my experience I would say that is a good size buck that made the rub. The size of the tree says one thing but, look at the height of the rub also. It's pretty torn up down low but, if you look towards the top of the pic you can see there is definately some gouges from rubbing up high to which means he probably has atleast some decent height to the rack. Like others have said, I would definately pick a spot in the area to set up. Good luck!