Got a sniper question, maybe 7thsfsniper can answer: was watching The Hurt Locker again (for about the 10th time), and I noticed how the images in the Leupold scope on the Barrett M107 were very indistinct; it seems like it would be very hard to accurately aim the weapon when you can barely see the target due to atmospheric refraction. I know it's usually hot in Iraq (especially out in the middle of nowhere, as the characters were), but is aiming a sniper rifle, particularly at longer ranges, really like that? How do you compensate for atmospheric refraction, even with a good scope? Or can you? Or is the spotter supposed to do the accurate spotting with his more powerful 20x scope?