For the record, I Googled the shit out of "depleted uranium ammunition" and the SWAT team hasn't arrived yet. And fuck 'em if they do. They can escort me to my car when I leave for work.
If there was such a thing, and you could buy it, it would be the greatest marketting coup since anti-bacterialogical soap. You would pay more for something that doesn't do anything that regular armor-piercing ammo doesn't. I promise you, it's just as well that it doesn't exist.