  This article describes a simple method for using a PC soundcard to accurately
measure bullet velocity. The method involves placing the microphone within a
foot of the muzzle and firing at a steel target between 50 and 100 yards away.
The time of flight for the bullet is simply the recorded time between muzzle
blast and sound of the bullet hitting the target minus the time it takes the
sound to return from the target to the microphone. The average bullet velocity
is simply the distance from the muzzle to the target divided by the time of
flight of the bullet. This method can also be applied to measurement of
paintball velocities.
