I was pointing out that it normally has to go through a hub not the individually owned stores is all but yes you are correct about the ORM-D stuff.Not sure if that's a typo but nobody, including FFLs, can ship ammo via UPS or FedEx unless you have their ORM-D training and the training is around $500 if I recall correctly.
I would not ship anything USPS. I have had really bad luck lately with USPS. I had on rifle show up 25 days after it was to be delivered and another show up 23 days after the date it was to be delivered. Both were shipped priority 3 day with tracking and insurance, and when I called UPSP they had no idea where the package was, but miraculously when the ATF was called and a claim made on insurance they found them and got them to me ASAP.
Sent a USPS money order to Nebraska 3-day Priority. Didn't show for three week so I sent another to a ****ed off seller. The envelope with the money order torn and mangled was returned to me in a plastic bag by USPS. I am waiting on a non firearm package from Florida shipped Priority Mail Sept 18 and last seen by USPS Sept 25??????