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Originally Posted by norwestalta
I would like to know as well.
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There isn't enough room to type it all out!!! And its all math and stuff!
A fellow named Bryan Litz wrote a really good book about external ballistics. And there is plenty of info in there regarding transonic flight.
Basically, as a bullet moves from super to sub sonic, air pressure moves forward towards the front of the bullet. This movement can effect the flight of the bullet. If the bullet is not well stabilized, it can't stay pointing forward, and will begin to yaw. A well stabilized bullet can go through the transonic zone more easily.
Other environmental effects (wind) can come into play to further cause the bullet to yaw.
R.