I have several rounds of 30MM Armor Piercing, possibly incendiary, ammo.
Does the ammo have any value?



Yes, they are fully demilled,
Yes, that is real depleted uranium in the shell.

Someone did a very interesting job of sectioning the shell!!



Where would you try to sell them, GB, or eBay??

There are military collectors which are hot for things like that, and quite a few of them. Post your question over on the International Ammunition Association forum. You can also sell there (as you can sell guns here) but I think you need some minimum experience history before they will let you do that.