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http://www.arl.army.mil/arlreports/1999/ARL-TR-2065.pdfAccording to their tests, the standard deviation of aiming error for the best, formally-trained operational snipers was three times worse than tested High Power and Long Range competition shooters sufficiently skilled to compete successfully in national level match competition at Camp Perry and the like.
In fact, the worst competition shooters tested were as good or better than the best snipers in basic holding and shooting fundamentals.
http://armyreservemarksman.info/2012/12/14/shooting-skill-snipers-vs-competition-shooters/
http://www.arl.army.mil/arlreports/1999/ARL-TR-2065.pdf
...But low-crawling for hundreds of yards, and living in a hide for a couple of days is not part of the Camp Perry routine......
Also, some of the competition shooters might have included the AMU guys, who are crazy good.
Another thing to consider is long range competition shooters are making wind/mirage calls on their own all the time. A sniper team has two sets of eyes and calls are usually made by consensus of the two man team. IMO the hardest thing about shooting past 500 meters is staying on top of the wind. If you're good at estimating wind on your own you'll be more accurate.