Here’s the official “word” - PROHIBITED
Not much room for interpretation.
There’s even a caveat in there disallowing any exceptions by anybody at anytime. So if AKMS or I, being the #1 and #2 best postal employees in the world, tell you it’s OK to ship via USPS, it’s still not gonna fly in court. No exceptions at no time, no how, no way. Pretty plain.
Inert ammo is unrestricted, domestically. It’s inert. Just a chunk of metal. No restrictions.
Let he who is without sin…