That's a wonderful chronological ordering of "experimental overloads". Is it important to the life-expectancy of the CZ52? ONLY if you use overloaded ammunition. While it's nice to know that the Tokarov will survive deliberate abuse, it's meaningless.
In March, 2000, a letter "debunking" the "myth" that Czech ammo was loaded hotter was submitted. How nice. Was the Czech ammunition tested from the original specifications, or export ammunition? We know that the CZ52 was replaced in military usage in the 1960s. Ammunition manufactured afterwards could quite possibly have been loaded to the Soviet standard.
In 1970, the Army did testing on the ammunition that it had obtained. It lists 42k c.u.p. as the discovered standard pressure. The Russian version was loaded lighter, for whatever reason. Again, so what? In 2000, had the Russians uploaded their ammo for the PPS guns, as the TT33 was obsolete?
Velocity isn't attained ONLY via pressure. However, the Russians, themselves, in the 1960s published a warning on the use of Czech Ball in 7.62x25 in their Tokarov pistols. Evidently, they felt it necessary, but the TT-33 was a substitute standard by then, having been replaced by the Makarov.
All I can find in this entire missive is that you will destroy a CZ52 barrel at OVERLOADED pressures below that which will rupture a TT-33 barrel. Why are we overloading the ammunition in the first place, and how does this concern the user who fires commercially available ammo, or even uses the latest re-loading manuals?
The Title is Czech 7.62x25 safe for CZ-52. I find nothing in the information presented that would question the safety of the CZ-52, or it's user, unless deliberately over-pressure ammunition was used. If that happens, it's the person who uses it's fault.
I will say, however, that the research presented is no doubt true, as far as it goes. It's been done in a scientific manner, and is arguably the best presentation that I've ever seen.
FYI, my ability to speak on Czech records for the CZ52 was provided by the military attache' at the Czech Embassy in D.C. in 1992. Through contacts in the government, I was allowed to interview him on this subject. He had researched it purposefully prior to the meeting.