I recently shipped some ammo. The best way I have found is to ship by UPS.
https://www.ups.com/us/en/help-cente...mmunition.page
Pretty easy. Ship the shells in its box. I wrap cling Wrap or cover in Brown paper to hold the shells snug. Place in box padded well. Place a ORM-D label or black and white Diamond on outside of box. ( print off internet). Go to actual UPS company freight center. Tell the person you are shipping ammo. Done deal. There is no extra charge for shipping ammo. Don’t try to go to the private owned UPS stores. They will not ship.
Hope this helps. Destry I have some you can have but they are 1oz #9’s marked Target.