Well it looks like water but water at high pressure launched from a cannon wouldn't really travel in a sphere, not totally sure but it seams like it would be more spread out. And if you watch it closely it actually looks like a solid. And the amount of damage it does to the slug. I think it is lead or some other soft metal. I don't have my speakers on so they say anything about it? That's a tough physics problem just to get the collision, crazy.