Last week I sent over 100lbs of loaded ammunition to someone here in the US.
I had to label it properly and ship via UPS

Look here for a simplified guide to shipping ammo.

Also, as I've had a good relationship with my local UPS store owner, he took my properly labeled crates of shotgun ammunition and put them through the system for me.
I didn't have to go to the shipping hub.

Cheers
Tinker