"Keith Kissane" wrote in message
...
In article ,
"John Keeney" wrote:

While I suppose they would be predictable, I'ld be kind of surprised
that anyone had. Was there experience with unmanned missiles or
projectiles to showed it?

Sure, anyone who's ever worked the target pits on a rifle range heard
the crack of supersonic bullets as they pass overhead.

But how many of them would have reconised it as sonic booms
and how many times do you hear two from a single bullet?