In your part of the country I would say it's very likely that if he makes it through this year he'll put on close to 30" next year, if not a little more. He's probably a 2 1/2 year old deer right now, and from 2 1/2 to 3 1/2 they really put on some mass, tine length, and possibly some extra tines. Yes, it would be ideal to allow every buck to reach maturity before we harvest them, but in the real world that just isn't possible. In my opinion, if he would be your biggest buck to date with a bow, go ahead and harvest him. You can't start off shooting only trophy bucks or you're never going to build up the proper confidence, patience, and dedication that it does to do so on a consistant basis. It's like they say, you have to crawl before you can walk. Even the best trophy hunters in the world started out shooting small bucks and working their way up. If you get another chance at him, by all means take it.