There were several Russian 9x18 rounds developed over the years of various weights and pressures, most ranged between 20,000 and 24,000 PSI. The Czechs designed a 69gr load in the early 1980s that traveled at 1350fps out of their CZ 82s that had a chamber pressure of 24,650 PSI. The ammo being reviewed today has a chamber pressure of 24,500 so it's actually slightly under what the Czechs used as their service round
I would appreciate it if you could give your sources for the chamber pressure of the Czech 69-gr load, and for your sources for the Russian loads that produced pressures of 20,000 to 24,000 PSI. This is the first time I've ever seen those pressures quoted and of course, on the internet, sometimes actual data is a modifier.