I can check tonight and see if the cylinder is long enough -- I think it is. (I have a .30 Blackhawk and I have some 7.62x25 ammo) And it certainly should be meaty enough. But have you priced Tokarev ammo lately? It's not cheap anymore, and it completely disappeared for a while last year.
You also may have problems with the shoulder bumping forward when it's fired, then the case heads will stand out a little and jam the cylinder from rotating.
"The only way to stop a bad guy with a gun is with a good guy with a gun"