Ammunition is never allowed in carryon luggage in the cabin.  However, you can check ammunition, if you take certain steps.

You can bring small arms ammunition for personal use in your checked baggage only. Ammunition can be packed in the same container as a firearm, but it must be in cardboard (fiber), wood, metal, or other packaging meant for carrying small amounts of ammunition.

Each Passenger is allowed up to 11 pounds of ammunition (including the container).

Gunpowder, primers, and percussion caps are not allowed in checked or carryon baggage. Additionally, loose ammunition, loose magazines, and clips are not allowed.

Paintballs must be packed in a leak-proof container and are subject to limited release.

Learn about checking firearms and gun transportation requirements.

Traveling on an itinerary involving a partner airline? Keep in mind that the partner airline may have different guidelines.