.50 is for material destruction and setting fires, not hitting people in the head. what makes you think that a guy would be dumb enough to just stand there, fully exposed, in daylight, in open country, for the 2 minutes or so it would take you to evaluate everything, set up and get the hit? Any sort of movement on his part = a miss, at 600 yds, much less 1000 yds. If the range is off by a mere 100m, you'll have to adjust sighting for it. You can handle men with rds that cost much less. The .50 is for using incendiaries against fuel dumps, propane tanks, liquid fueled rockets, etc. It's a huge waste of money and time.