The ammo with hard primers was, according to popular belief, intended for SMG's primarily. I don't know how accurate that information is. So if you have a CZ-26 SMG (you can build them from parts kits and 80% receivers fairly inexpensively) or a semi-auto PPSh-41 from Military Gun Supply, then it should work just fine, while the softer ammo is better suited to your CZ-52 or TT-33 pistols.
Wolf Gold is currently the only widely available source of JHP ammunition in 7.62 Tokarev, though other manufacturers currently make it, and Reed's Ammo makes custom ammunition in the caliber.
As for its velocity and 'legality', that's just bullcrap. 7.62x25mm Tokarev isn't any less suited to self-defense than any other caliber simply because of its high velocity and penetration. Really, the only reason I would hesitate to use the caliber for self-defense is the fact that hollowpoints in the caliber are quite new and there hasn't been much research to find out if these .30-caliber pills are reliably lethal. There is no reason why you would get in trouble for using a particular caliber or type of ammunition in self-defense.