Can I get rid of old ammo there?

Yes

Or are you wanting to sell it? Is it shoot able though? Thank you

Can you still shoot chickens there

Yes but depends on caliber. All the most common calibers are there as new. You have to really search for obsolete or wildcat loads.

Yep

You can shoot the ammo there. As far as any other disposal method, you might call & ask.

Not really sure , there's always someone there that will take it.

Yes you can.