Re: Which 7?
You dont need hyper velocities to kill game at extended ranges. I do admit you need sufficient velocity though. IMHO, the 280 AI has enough to be a efficient LR hunter. I think that particular round is much more accurate than the other 2 and MUCH easier on barrels. A nice bonus, as you mentioned, you would not have to re-cut the bolt!
Long range shooting is a process that ends with a result. Once you start to focus on the result (how bad your last shot was, how big the group is going to be, what your buck will score, what your match score is, what place you are in...) then you loose the capacity to focus on the process.