Hylander, you can try and call them, but I heard some time back that River Valley Ordinance has been out of business for several years now, death in family or some kind of problem. I hope I am wrong but dont think so. Here is two alternatives if RVO does not work out:
1. Poly Gun Bags has bullets, including pulled .30 cal M2, scroll down to them after clicking link to their bullet page below.
Bullets
2. Widener's is selling newly manufactured ones, have not seen any range reports but they look good in the photo. You'll have to copy and paste the link below into your internet browser, or just go to "www.wideners.com", click reloading components, then bullets, then mil spec bullets, they are on the 2nd page.
http://www.wideners.com/itemview.cfm?startrow=13&dir=278|281|727