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The .300 Winchester Magnum (known as .300 Win Mag) is a popular, belted, bottlenecked magnum rifle cartridge that was introduced by Winchester Repeating Arms Company in 1963 as a member of the family of Winchester Magnum cartridges.


The Precision Sniper Rifle (PSR) program launched in 2009 as a US Special Operations Command (USSOCOM) sponsored program, which supports Army, Navy, Air Force, and Marine Corps Special Operations Forces. The goal of the PSR program was ambitious: to replace all bolt-action sniper rifles used by special ops snipers with a single bolt-action rifle chambered for magnums like the .300 Win Mag and .338 Lapua Mag.