Depends on where you live. Many localities have a Haz Mat drop off center where anything can be dropped off. Chemicals, pesticides, oil, paint and even ammo. Call your local trash people.

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Still Running Against the Wind

This is what I was thinking. Many municipalities have a hazardous waste disposal center.

EDIT: OK I just looked and found out my own municipality won't take ammo. They say call the County Police.

Plan "B" would be to take it to a local range and see if they have a dud box you can put it into.