Thank-you for pointing out the thread in the DR forum keith. What a coincidence.

I was unaware of Burrard writing on the subject. Likely read that years ago and since I had no use for the information then just forgot about it.

Quite an interesting subject.

The part about shooting straight up and causing a ring would seem to verify the pressure wave mechanism as real.

In a shotgun, the crush section apparently defeats the pressure wave.


"The price of good shotgunnery is constant practice" - Fred Kimble