Its hard to judge a bucks rack in the head down position. Its like the going away view. The third pic shows the more accurate size. He is either a buck with a huge head and ears and a good rack. Or average body sized with not a big rack. He's in velvet with his summer coat so Im guessing low 170,s.
However he's not a dink. He's a solid 4 pt. with cool stickers. You did some great work to get him on camera. He may well be above average for the area he's in. If so I say Try to take him.
Thanks and Good Luck