Take it down to the local gun store and ask. They are the best place to ask about this kind of stuff.
If, for some reason, they don't have anything to say on the subject (I see no plausible scenario in which this would happen,) I would put the old ammo facing upward in a 1-lb coffee can, pour in concrete, and when that dries, encase that upside-down in a 3-lb coffee can, then take the whole thing down to the local dump and turn it in as hazardous waste.
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