The Nikon Sniper by Thalamocortical

The longest confirmed sniper kill in combat was achieved by Craig Harrison, a Corporal of Horse (CoH) in the Blues and Royals RHG/D of the British Army. In November 2009, Harrison struck two Taliban machine gunners consecutively 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.[39][40] The QTU Lapua external ballistics software,[41] using continuous doppler drag coefficient (Cd) data provided by Lapua,[42] predicts that such shots traveling 2,475 m (2,707 yd) would likely have struck their targets after nearly 6.0 seconds of flight time, having lost 93% of their kinetic energy, retaining 255 m/s (840 ft/s) of their original 936 m/s (3,070 ft/s) velocity, and having dropped 121.39 m (4,779 in) or 2.8° from the original bore line. Due to the extreme distances and travel time involved, even a light cross-breeze of 2.7 m/s (6.0 mph) would have diverted such shots 9.2 m (360 in) off target, which would have required compensation. The calculation assumes a flat-fire scenario, utilizing British military custom high pressure .338 Lapua Magnum cartridges, loaded with 16.2 g (250 gr) Lapua LockBase B408 bullets, fired at 936 m/s (3,071 ft/s) muzzle velocity[43] under the following on-site (average) atmospheric conditions: barometric pressure: 1,019 hPa (30.1 inHg) at sea-level equivalent or 899 hPa (26.5 inHg) on-site, humidity: 25.9%, and temperature: 15 °C (59 °F) in the region for November 2009,[44] resulting in an air density ρ = 1.0854 kg/m3 at the 1,043 m (3,422 ft) elevation of Musa Qala. CoH Craig Harrison mentions in reports that the environmental conditions were perfect for long range shooting, no wind, mild weather, clear visibility. In a BBC interview, Harrison reported it took about nine shots for him and his spotter to initially range the target successfully. http://bit.ly/1sWBTU9