Can I bring an old artillery shell on a plane?

I have been travelling in Europe, and picked up an old artillery shell that the seller told me was empty. When I went to inspect it at home, I removed the projectile and found that the shell is in fact empty, but that the projectile has not been drilled. For more context, this is very likely a 25mm Hotchkiss anti-tank or anti-air artillery shell that has a timed fuse head. While the powder in the head is inert, I am not sure if I can bring it on the plane(in checked baggage or carry-on) back with me to the US.

Does anyone know whether this would be allowed both on the plane or through customs? I am flying American Airlines out of France into the US

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What can you do with empty bullet shells?

This has been your hunting season reminder that empty shells should be taken to the local police station for safe disposal. Visit the nearest police station to you for safe ammunition disposal.

What is not allowed on a plane carry-on?

Here's what you can't pack in your carry on: Liquids, gels, or pastes in bottles larger than 3.4 ounces (100 ml) Guns and ammunition (including BB guns and cap guns) Stun guns and tasers.

What is a spent round?

Individual rounds or cartridges or an artillery piece or firearm that have been fired, are called spent rounds. The propellant (powder) has been ignited and vaporized, the projectile (artillery shell or, for a firearm, the bullet), and all the remains is the casing that contained the powder.

What can you carry-on a plane?

You're allowed to bring 1 quart-sized bag of liquids, aerosols, gels, creams and pastes in travel-sized containers that are 3.4 ounces (100 milliliters) or less per item. TSA also allows certain duty-free liquids through security in your carry-on bag if they're packaged in a security tamper-evident bag.

Why People Don’t Like Artillery Shells

Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.

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