Orion,
What you are proposing is not near as easy as you make it sound.  Long range shooting is a discipline that takes lots of time/dedication/knowledge/equipment/money and some other stuff that doesn't leap to mind.  Practice is paramount--along with a place to practice.  Judging distance is vital, reading wind is vital, along with LOTS of practice.  Your equipment must be right, but it is not near as important as the nut on the rear of the rifle.  Give up on 5.56 for long range.  This, of course, depends upon your definition of long range.  True long range shooting demands a .50 BMG for best results.  A .300 WM is good for intermediate "long range."  A .308 Win. is good out to 1,000 yds., but that is pushing it.  Good glass is vital, but realizing, the scope mounted to hit at 1,000 yds. cannot be used at 100 yds. very well.  A .30-06 Spfld. drops 54 [b]FEET[/b] at 1,000 yds.!!!  Practice, practice, practice, beginning at 300 yds., then work your way out to the limit of your ability and your equipment's ability, then practice more and upgrade equipment.  Bottom line, what you are contemplating is way more difficult than the anti's make it sound.