BM I am the 1st to say give that rifle to the untrained and they will not make that shot, give the sniper a rack grade 700 sporter and he will do better than anyone else. The distance called was 979, I don't know yards or meters, either way a head shot at that distance probably would not happen with the standard rifle, and truth, would be bad ass with the M40, mine shoots 7" on a great day at 1,000 yds. That means on a great day, it will hit 3.5" from point of aim. Easy to miss a head size target, but no problem on a torso.
It's TV, but I think the spotter was 1st because he had eyes on them, could call in Artillery on their location. Could just be TV drama as well.