Note the two variables, dry air and temperature! because gas molecules move more slowly at colder temperatures this slows the speed of sound, sound moves faster through warmer air. This is 1,236 kilometres per hour, or a kilometre in 2.914 seconds, or a mile in 4.689 seconds.Īt sea level a generally accepted value is 340.29 m/s, and this value decreases as the altitude increases. Contrary to what a lot of people believe the speed of sound is not a fixed value, in dry air at 20 ☌, the speed of sound is 343.2 metres per second (1,126 ft/s). Let me state this up front, I am not a ballistics’ engineer, so this is the very basics of what actually happens, but it gives a very good idea of what actually happens to a bullet, and how much design and engineering work is done to find the optimal bullet shape, weight and profile.įirst of all let’s define what the speed of sound is. What this basically means is that the bullet will be moving faster than the speed of sound, then move through the sound barrier, and then move slower than the speed of sound until the bullet, in theory, comes to a complete stop. Supersonic, Transonic and Subsonic BallisticsĪny bullet fired from a high powered rifle will go through the Supersonic, Transonic and Subsonic phase when fired over extreme range.
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