Ship it UPS. Package it very securely with nothing else in the package, especially do not package ammunition and firearms in the same package. Ammunition can only be shipped between the contiguous 48 states, no shipping to Alaska, Hawaii, International or anywhere that requires air flight. Only 50 cal. or smaller ammunition can be shipped. Print clearly on at least three sides of the package "ORM-D". Take it directly to UPS or schedule a UPS pickup. Do not take it to the USP store, they will refuse it. To verify if there have been any recent changes to these rules, you can call the UPS Hazardous Materials Support Center at 1-800-554-9964.