I saw some guy do this, and it looked like a fairly large investment in time. And to be frank, as much as I like the Tokarev, I can't see investing that much time in it.
Can the surplus ammo be reloaded? I wasn't sure if they were berdan primers.. Which bullets have you been using?
I saw this youtube video where the guy converts .223 brass into 7.62 brass.
http://youtu.be/MhG08yQGD38