In the game we are playing right now, a character was a sniper who tried to kill a criminal, but failed because the criminal was actually a vampire.

Now, the sniper is a vampire too, and he's obsessed to be able to shoot a vampire dead. So, he's asking his sire to get incendiary or explosive ammunition.

Now, I don't know much about guns, so I need help with the effect these bullets would have on vampires. I have read about the damage they do (or used to do) on vehicles, but I don't know which effect would be on a human (or vampire) body.

* What would happen to a vampire shot with this kind of ammunition?
* What kind of damage (bashing/lethal/aggravated) would she suffer?
* Can this ammunition be shot with a sniper rifle or a pistol ?
* How hard would it be to obtain?
* Is this ammunition dangerous to use?
* I have found the ammunition in WoD combat, it says it causes great wounds, but they are only +1 damage, and type of damage is not specified. Are there any other source about the subject?

Please use understandable terms to someone who is not very knowledgeable in weapons.