Originally Posted by
Ridge Runner
how is a well practiced 700 yard shot lrss sure than one that is closer?
Some basic geometry of similar triangles provides the answer: 1 inch off at 100 yds = 7 inches off at 700 yds. So you would want to be in a 1/2" group at 100 yds.
But hey, if you can shoot that well (I can't) then more power to you!