Your only legit options for shipping live ammunition in the US is either using
UPS or FexEx “GROUND”. If the weight of an ammunition shipment is over the
weight limits of either of those two companys your option is to use a private
common carrier trucking company.
If you opt to use UPS, be aware that many of the “UPS Stores” which are a franchise, may refuse to accept ammunition for delivery, use one of the UPS
service centers instead
NEVER, NEVER, ship ammunition via US Postal Service… this fact has been mentioned many times on the forum.