Don't waste time and effort reloading 7.62x39. If you shop around, you'll find a variety of ammo out there that would cost you a lot less than reloads. I don't see too many precision applications for that particular round, so other than cost considerations, I can't figure out why anyone would spend time reloading that caliber.
As others have stated, check out the reloading forum. If you're able to take a reloading course, that would help out a lot as well.
Good luck!