The muzzle velocity of given firearm is : -

The revolver, which tends to have a low muzzle velocity of 150 m/s, is a short barreled weapon with its ammunition held in a metal drum, which rotates each time the trigger is released. The muzzle velocity of pistols varies between 300 and 360 m/s. The rifle is a long-barreled shoulder weapon capable of firing bullets with velocities up to 1500 m/s. Reference – Clinical Forensic Medicine by Margaret M. Stark - 144