"John Keeney" wrote:


"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?


Well, I've worked in the pits at rifle ranges and the only odd
thing that I've noticed is that you can tell when 'your' shooter
fires because the report is a bit louder and sharper (even on a
range with lots of targets + it doesn't seem to matter what
distance is in use either).

Another surprising thing is that if you're lying beside a shooter
and using one of those range spotting scopes (25 power?) you can
actually see the bullet going (.303 British cal.). Looks sort of
like a 'shimmery ball' and it's likely the shock wave that you're
seeing.
--

-Gord.