Tristian,
To answer your first question: furthest distance shot so far is 1500 yards, more or less, I took 3 shots with my friends ar-30 and I hit on the third, low from center mass and the first 2 shots were complete misses because the scope was not doped at that range, I started out shooting 1000+ yards a few months ago and I can say that you have more experience than I have by a few years then, the target was a cardboard box no bigger than 20 x 20(I think) and I can't read the wind that well yet but I am able hold over, being only a few months into shooting.
2.)The target that I am trying to hit would be at most a 10 x 10 or even smaller, I understand if there is a little to no chance in being that good of a shot if possible at a mile but I will do my best in learning what I can to get the closest I can to it.
3.)As far as consistency goes, I at least want to be able to put 15 out of 20 rounds on target at that range.
4.)Yes. To shoot at a mile target with accuracy, precision, and consistency is my goal, no matter how small or how big that target is.
I don't have my own weapon yet but I plan on getting a dpms sportical, .308 caliber, and then making modifications to it to shoot at that distance accurately along with having consistent groups without missing.