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The CCI Standard Velocity seemed a little louder. The next quietest was the Federal suppressor American Eagle 45 grain load. 22 pistol at temperatures lower than 40 below zero.Īs a purely subjective measurement, the quietest ammunition, using a suppressor, was the CCI Quiet. It is expected few shots will be fired from a suppressed. As relative humidity increases, there is a slight increase in the speed of sound, just a few fps. Atmospheric pressure has little effect on the speed of sound. At 70 degrees Fahrenheit, it is 1128 fps.

As the temperature rises, so does the speed of sound. While the speed of sound varies with temperature, even at 40 degrees below zero, the speed of sound is above 1000 fps. As can be seen from the chart, all of the rounds tested were reliably subsonic from the pistols tested.

Subsonic 22lr with suppressor