I have killed a big bodied whitetail at 540 metres, using 140 Accubonds in my 270WSM. The range was taken using a Leica 2700B and after multiple shots from the laser. I killed him, but he did not go down hard. He ran a long way and still needed another shot to put him down. The first bullet went into the lungs but there was not much expansion nor damage. The second shot was high on the neck so I could get a good look at the limited damage in the lungs from the first shot. I love my 270WSM and my 270Win, but I do not plan on any more long range shots unless I am carrying one of my 7mms or 300s.