Do these track? Are they accurate/dependable? I am looking at 2 of the VX5HDs for my sporter weight deer rifles. Shots will be under 400, and minute of white tail. I haven't had bad luck with Leupolds when I needed a light weight set it and forget scope. Typically shots will be well under 200 but I am getting some properties that might require a poke across a field. Is the 100ish upgrade for that turret worth it?