This Marine Corps sniper put a bullet in a target nearly 8,000 feet away — here's how he took one...

Staff Sgt. Hunter Bernius, a veteran Marine Corps scout sniper who runs an advanced urban sniper training course, walked INSIDER through his most technically difficult shot: He fired a bullet into a target roughly 2,300 meters (1.4 miles, or 7,545 feet) away with a .50-caliber sniper rifle.