At most distances other than extremely long range (eg. Arica Harbor Conquest Spawns) aim at the top of the head or slightly above the head. I think that if you hit the guy in the jaw or neck area it still kills them and the bullet drop isnt as bad as you might think. Also, don't just sit in some bush in your spawn please, try to get quick kills at about medium range. Also, as a sniper, do not sit there still the entire time, if you see another sniper trying to kill you, move side to side until you get a good target and stop for half a second and shoot. Use your secondary alot also if you get into close quarter engagements though a hit to any part of the body in close range is a kill with a sniper so you can try to no scope em