Re: long range shooting schools
The suggestion to join the Ft. Benning Rifle Club is a good one. I did that a number of years ago and took both rifle and pistol classes there. I learned a lot and had a good time doing it. There were some fantastic marksmen there and a deep pool of knowledge to draw upon.
I am sure that most of the people I was acquainted with at that time have moved on, but I have no doubt that people of the same level of expertise are still there. At the time, they used to have night tactical rifle matches in the summer. If they still do that, I would highly recommend taking advantage of the opportunity.