It was recently revealed that, last November, a British sniper (corporal Craig Harrison) set a new distance record when he killed two Taliban in Afghanistan, at a range of 2,620 meters (8,596 feet). He did this with a L115A3 rifle firing the 8.6mm Lapua Magnum round. The previous record was held by a Canadian soldier, corporal Rob Furlong, who dropped an al Qaeda gunman at 2,573 meters (7,972 feet) in 2002, also in Afghanistan. Furlong, however, was using a 12.7mm (.50 caliber) rifle. These weapons are good at 2,000 meters or more, but weigh twice as much as the 6.8...