A Marine manually extracts and chambers a current round in his bolt-action M40A3 contract killer rifle. The screw helve is held in the shooter's hand and is not visible in this photo
A Marine manually extracts and chambers a new round in his bolt-action M40A3 hatchet man rifle. The bolt handle is held in the shooter's hand Sniper Rifles and is not visible in this photo

The most hip military sniper rifles (in terms of numbers in service) are chambered for .30 calibre ammunition, such as 7.62×51 and 7.62×54R. Since sniper rifles of this class must compete with definite other types of military weapons with companion range, snipers invariably must employ skilled field craft to conceal their position.