Turns out that depleted uranium isn't too difficult or unsafe to handle. "Depleted" means that most of the fissile materials have been refined out and made into bombs or enriched reactor fuel. The danger from depleted U is heavy metal toxicity. The exposure is from dusts and smoke from heating in the gun barrels or fires from where they hit. DU is radioactive, but at a very low level; barely detectable above background. Don't chew on one of the projectiles, and you'll be fine. All that said, I don't know if there are any explosive DU projectiles today. In my day, they were strictly kinetic.