I have found that Fed Ex offers better rates then UPS. When I have sold ammo, I only charge the actual rate and do not add anything for packaging or my time to drop off the ammo. Since the buyer is paying shipping, I offer either UPS or Fed Ex. Most buyers want the cheapest service unless they have had a problem with either shipper. Both Fed Ex and UPS have retail centers 5 minutes form my home so it is no big deal to go to either one. In your case that may be a deciding factor in who you choose to ship with.
Here are some links to download ORMD lables, in blue, white and black courtesy of links on ParallaxBill's Curio and Relic web site.
black labels http://www.type03.net/ammo/orm-d-black-sheet.pdf
blue labels http://www.type03.net/ammo/orm-d-blue-sheet.pdf
white labels http://www.type03.net/ammo/orm-d-white-sheet.pdf
Hope this helps, Ken