One of Newton's laws of motion says something like, a body in motion tends to stay in motion unless acted on by an outside force. The minute of angle measurement has nothing to do with distance, only the angular measurement that represents the cone of fire for a firearm. After a bullet leaves the muzzle of a rifle, and assuming there are no other factors effecting the bullet path, such as wind, gravity, etc. the bullet will strike wherever it has been influenced to by the barrel, load and shooter. If the path averages one minute of angle at 100 yards, it will be one minute of angle at 200, 600, etc. At least that's my story and I'm sticking to it....right now.
I've read information on a website, that I can no longer find, that basically says that bullets are not perfectly balanced, and that the imbalance will cause the path of the bullet to oscillate with the result of changing the path of the bullet during it's flight which in turn produces different group sizes at different ranges....some of which are smaller at more distant ranges.
"For practical purposes" I still hold to the thought that a bullet will continue on its set path after leaving the barrel unless acted on by an outside force. Following Yoda's advice, "Don't think, just do!", the best way to find out for a given rifle is to try it.
Ohhh, my head hurts from thinking too much, think I'll go outside and "do" for a while.
Roudy