Got it off a image hosting website which just had the description "flaming bullet"
Obviously it's not a regular bullet but wtf is going on with the flaming tail there

Anyone know what it is?
Herdsman wrote:It's a prototype 'rail gun' test firing by the Naval Surface Warfare Center.
redrum wrote:So I can't get one in a sporting rifle?
Herdsman wrote:Forgot the link... http://en.wikipedia.org/wiki/Railgun
Aster wrote:I think you'll find that's the shockwave from the projectile.
P.S. That thing's moving at 2.4 kilometres per second if you didn't read the article...
bunnybuster wrote:Rail guns use electro-magnetic effect not combustibles,so what is the flame/fuel source ? I think it is a small gas cylinder fired from a tube.
Brute wrote:No fuel source, apparently it's this:
"Shock heating, the same effect which causes the "fire" trail on a spacecraft during re-entry. The object it moving so fast that the air does not have time to move out of the projectile's way, so it is compressed until it reaches a critical point where the energy stored by compression is enough to displace the air, and as it decompresses, heat and light are created by the expanding air. It basically is a string of explosive decompression fueled by velocity and air density alone."
bunnybuster wrote:Rail guns use electro-magnetic effect not combustibles,so what is the flame/fuel source? I think it is a small gas cylinder fired from a tube using the gas as propellant.