Quote:
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"...the high-temperature and high-pressure gas jet expanded at a much higher rate than the velocity of the moving body..."
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John,
Expansion waves will increase the velocity and increase the velocity to supersonic. Expansion waves are not normal shock wave. Very different animals. So when I said multiple post's back that expansion waves form....
It means the velocity increases.
You are very much misunderstanding and confusing when the report is talking about airflow behavior of the muzzle jet that has NOTHING to do with effects on the bullet.
Different subjects.
The FACT Normal Shock forms at the front and rear of the bullet isolates the bullet.
The FACT normal shock forms at the muzzle due the exit gases encountering the atmosphere means the air is subsonic at the muzzle.
Expansion waves will form on the crown and the report is saying the collision of those normal shocks changes the direction of propagation of the wave. There is not enough energy from the exit gases to effect the bullet.
That is what your report says.....