Check out the high speed photography in this clip. any photographers out there that know many FPS is necessary to film this at 5 x the speed of sound?
Well, in sort of an ironic final number, the projectile is traveling @ 1 mile per second! I say ironic, since when I was a boy, "a mile a minute" was sort of an iconic number.
So, at a shutter speed of 1/5280th of a second, the projectile would travel about a foot.
Accordingly @1/52800 of a second, the projectile would move about 1 1/4 inches during the exposure, and at a half millionth of a second perhaps an eight of an inch.
I would guess that there's no mechanical shutter involved with this type of photography nowadays, just electronic switching. The frame buffer and the capture electronics would have to be spectacular though.
Wiki says, (and we all know they don't lie) that the fastest high speed cameras are on the order of 200,000,000 FPS;
http://en.wikipedia.org/wiki/High-speed_camera
If you're in the market for one;
http://www.photron.com/index.php?cmd=products
What's really amazing about the video, is the fact that for a time, they seem to be panning the camera along the shell's path.