<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: ArcticLight</div><div class="ubbcode-body">Saw a show today where NASA has a gun that shoots at Mach 13 - to test for asteroid impact.
Their bullets flash when they hit....Impressive!
5 miles a second - that's 26,000 fps....whew....
They film at almost 1 million frames per second, this is all multimillion dollar equipment but impressive!</div></div>
I think I saw this a year or two ago in American Rifleman. They use a squeeze bore to get it to seal and get close to the expansion rate of the fuel. They were shooting a plastic BB at a 6 inch or so piece of steel and it went clean through the thing. I will have to see if I can find it.