Military snipers shooting at a measured 1000 yards will aim over 30 feet above their target to allow for bullet drop. Wind, weather, vertical incline, altitude and even temperature also all have to be taken into consideration.

To see it done it looks as if they are shooting up into the sky (even if the round has lost a lot of energy there I wouldn't want to be on the receiving end) - just a bit of trivia for ya!

Bob