The most popular military sniper rifles (in terms of numbers in service) are chambered for 7.62 mm (0.30 inch) caliber ammunition, such as 7.62×51mm and 7.62×54mm R. ... Maximum effective range. CartridgeMaximum effective range (m) .300 Winchester Magnum900–1,200 .338 Lapua Magnum1,200–1,500 12.7×99mm NATO1,500–2,000 6 more rows