Re: long range
If those are the 3 choices, I would pick the 308 win. Lots of bullets, good size of bullets, VERY accurate and very effective on deer sized game to 600+ yards. Easy to load for, lots of data and info...Low recoil, long bbl life. Did I mention accuracy?
Hope that helps
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.