High Quality Content by WIKIPEDIA articles! The Precision Sniper Rifle (PSR) is a program by United States Special Operations Command to replace all current bolt-action sniper rifles in use by U.S. special operations snipers with a single bolt-action rifle chambered for a .338 caliber Magnum chambering like .338 Lapua Magnum or .338 Norma Magnum. The solicitation was placed on January 15, 2009.