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Yep that sounds about right to me too, and like r87mm says, the shot probably doesnt stay supersonic very long. Turbulent air from the rest of the shot string and a sphere isnt the most aerodynamic...

Just looking at some advertising brochures here and I have a question or two for those in the know.
If the speed of sound at sea level is approximately 1100 feet per second, why dont we hear some...