The longest is the M200 .408-inch sniper rifle produced by Cheytac Company of the United States, which can shoot a person's head within 2000 meters without modification under ideal conditions.
On July 13, 2004, richard machowicz, a former sniper of the US Navy SEAL, chose a standard steel target 2 122 meters away to shoot. The first three shots were distributed within 42.2 cm, setting a new world record. Previously, the world's recognized record of the longest single shot was set by Canadian forces in 2002. A Canadian sniper used the Tac-50 sniper rifle of McMillan Company of the United States, and after a correction, he killed a Taliban at a distance of 2,430 meters.
The caliber of 0.408 inch combines the accuracy of 0.338 with the power of 0.50, which is a patented caliber ammunition specially designed for Cheytac's firearms products.