Craig Harrison (born 1975) is a Corporal of Horse (CoH) in the Blues and Royals RHG/D of the British Army, and holds the record for the longest confirmed sniper kill in combat, at a range of 2,475 m (2,707 yd). Established in November 2009, this exceeds the previous record of 2,430 m (2,657 yd) set by Rob Furlong in 2002. This record was certified by Guinness World Records.
In November 2009, Harrison consecutively struck two Taliban machine gunners south of Musa Qala in Helmand Province in Afghanistan at a range of 2,475 m (2,707 yd) using a L115A3 Long Range Rifle.
In a BBC interview, Harrison reported it took about nine shots for him and his spotter to initially range the target successfully. Then, he reported, his first shot "on target" was a killing shot followed consecutively by a kill shot on a second machine gunner then a third which disabled the machine gun. The presumed travel time of the projectile was estimated at 6.017 seconds, and with a estimated drop of 120.95 m (396.8 ft).
In the reports, Harrison mentions the environmental conditions were perfect for long range shooting: no wind, mild weather and clear visibility.
The GIF above represents the relative size of the "target" and the position of the cross-hair at the above-mentioned distance and maximum magnification of the used scope (25x).
Here is a link to the Wikipedia article covering other known cases, including the previous record: http://en.wikipedia.org/wiki/Longest_recorded_sniper_kills