https://dl.dropboxusercontent.com/u/4934308/Arma%203/Screenshot48109%20Kopie.jpg
Here you can see bullet holes on the ground at a distance over 500 meters.
This must not be visible. Even at close range you would not be able to see the bullet impact and in Arma 3 bullet holes keep standing out incredibly at distance.
Since most of the time there should be gras or foliage at the ground - bullet holes shouldnt be visible at all over a certain range.
Only exception of course are buildings and such.
Greetings