I am older than you. And old enough to know I don't know everything. I am also old enough to recognize self appointed experts. Do you know any of these?
When all else fails.
I have several batches of E. European 7.62X25 that I shoot in aCZ52
These run 1575 to 1650 on the chrono. HOT! but safe as far as I can tell.
7.63 Mauser and 7.62x25mm are identical cartridges with only a pressure difference so hotter 7.62x25mm ammo could be used in the older Mauser chambering with possible dangerous results. https://en.wikipedia.org/wiki/7.62%C3%9725mm_Tokarev