Typically, bolt-action rifles have a longer range and are more accurate than semi-automatic rifles, however because each round must be chambered by hand, the rate of fire is slower than a semi-automatic rifle, which fires as fast as the shooter can squeeze the trigger. At close ranges, or in situations where a shooter must make a quick follow-up shot, a sniper may prefer to use the semi-automatic rifle instead. Examples of bolt action sniper rifles are the M40, R700, and M24. Examples of semi-automatic ones are the M21, Dragunov, and the M82 Barret .50 caliber.