I was just going to comment on that. Factory ammo is almost impossible to find, and extremely expensive when you do; along the lines of $80 for 20 rounds - or higher. Brass for the .480 is impossible to find. Starline may make a run next year sometime (I just exchanged emails with them on this subject). Hornady has supposedly stopped selling the brass, and now only sells factory ammo. I recently saw some Federal .480 brass in a picture, which is the first I knew that they had ever made anything for this cartridge. Right now, your only choice for brass is to buy Hornady .475 Linebaugh brass and trim it down to .480 size. Starline is accepting backorders for .475 brass, but not for .480. Wonder what percentage of the people ordering .475 brass really want .480?
Another note: You can form both .475 Linebaugh and .480 Ruger brass from .45-70 brass. Any brand other than Winchester requires inside reaming, and the rim needs to be turned down a bit unless your revolver was made to accept the .45-70 rim diameter. Oh, and Winchester .45-70 brass is made from unobtanium at this time.
ETA: I just checked both Hornady's and Federal's websites. Hornady lists one .480 Ruger factory load and no brass; Federal doesn't list anything for the cartridge. Plan accordingly.