For real.
I went to a gun show today, and there was a company there that specializes in making special ammo for military. Since I'm military, I was allowed to buy it. Basically this guy had all kinds of crazy ammo for different sized calibers. I myself have an AR-15, and it shoots 5.56mm NATO rounds. Long story short, I bought 2 of each type of ammo he had to offer for my caliber. I have Tracer rounds, Incendiary rounds, Tracer/Incendiary rounds (both in 1 bullet), Armor piercing, and Incendiary/Armor Piercing rounds.
Needless to say, that stuff is expensive! Cost me $50 per clip (10 rounds). Can't wait to try it out, but it'll be a while before I do. All I can say is that I want to make a dummy tank and zombie and shoot the hell out of them, and record it for your view pleasure.