more onthe speed of sound
The speed of sound is effected by air density. The more dense the air the higher the speed of sound. Hence teperature, barametric pressure and humidity change the actual speed of sound. As an exanple in sea water at sea level and 39 degrees the value is 4800 fps but raise the temperature to 78 and the it goes up to over 5000 fps air is the same way. it's complicated enough that they make tables to predict it. If you are not too high in altitude and in shirt sleeve weather 1100 fps should suit your needs. assuming your using a center fire rifle by the time the bullet slows to that point velocity is falling rapidly.
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