[Mike-M]

I noticed that the old Russian 7.62x23 round has a lot of similar dimensions to 9mm.

Did you happen to notice yet that it is 7.62x25, not the "23" you have locked up on?

Want a bottleneck? Why not propose the wildly-popular 7.65x21mm Parabellum or the universally-acclaimed 8x22mm Nambu?

Seriously...If one wants to do serious work with the most outstanding weapons-service auto-pistol round that has ever made it to production, just get a 357SIG G31, G32, or G33. It is no coincidence with its excellent characteristics that it too is a bottleneck round.

The 7.62x25 Tokarev is an interesting round for military use as a FMJ. The service pistols made for it (TT-33, Type 54, Vz-52, etc.) have been imported in large quantities. There will never be a demand for Glocks in this caliber, which is more than a little unsuitable for modern personal defense.