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This is the TSA requirement.
Travelers must securely pack any ammunition in fiber (such as cardboard), wood or metal boxes or other packaging specifically designed to carry small amounts of ammunition.
Firearm magazines and ammunition clips must be securely boxed or included within a hard-sided case containing an unloaded firearm.
Small arms ammunition, including ammunition not exceeding .75 caliber for a rifle or pistol and shotgun shells of any gauge, may be carried in the same hard-sided case as the firearm, as long as it follows the packing guidelines described above.
http://www.tsa.gov/traveler-information ... ammunition" onclick="window.open(this.href);return false;

This is United Airlines requirement.
No more than 11 pounds of ammunition may be carried. The ammunition may be packed in the same container as the firearm or in a separate container. Ammunition must be packed in the manufacturer's original package or securely packed in fiber, wood or metal containers. The ammunition inside the container must be protected against shock and secured against movement.
http://www.united.com/web/en-US/content ... ports.aspx" onclick="window.open(this.href);return false;

Print Unoted's policy and TSA's policy ant take them with you. Print any other airline policy that you are going to fly and be familiar with all policies. The airline is not to have anything on the tag or bag that identifies your bag as having a gun.