UGVs? Technically their machine gun is computer controlled.
Air Burst mode.
Hell, forgot about the Air Burst Grenades because i never use the nade launcher...
As in computer-controlled, I was more thinking of a gun that's at least partly computer-controlled on the inside, rather than purely mechanical. Regardless of whether it's being handled by a human or a machine.
To be precise DU is pyrophoric under certain conditions... heated particles that are above about 500 degrees c ignite on contact with air and burn at 3000c.
Needless to say, the fragments of a DU projectile that just punched its way through a foot of armor are somewhat above 500c...
It's not the primary effect of such weapons but it is a rather noticeable side effect.
Well, most metals tend to burn when you increase their surface far enough. Aluminum would burn quite awesomely, but it's not very hard so it's out of the question
Is the weight a big factor? I'd expect the momentum of a projectile fired from the same gun, with the same amount of porpellant, to always be in the same order of magnitude. That means heavier projectiles should come out of the gun slower.