For completeness, also tried inserting 7.63x25, 9x19 and 9x25 cartridge into a "Red 9" pistol. Obviously, 7.63x25 and 9x19 cartridge can be loaded and fired from it. 9x25 cartridge won't load and fire, the bolt cannot close with cartridge case protruding out so much. That would explain why there was no need to add a "9" on grip panels when 9x25mm pistol appeared in prewar era -- 9x25 cartridge won't load into 7.63mm nor 9mm pistol.
7.63mm and 9x19 cartridge could be loaded into 9x25 pistol, but it's OK to fire a relatively weaker 9x19 cartridge from a 9x25 pistol. And, how about firing 7.63mm cartridge from a 9x25mm pistol?? the feeling must like firing a pistol with "shoot-out" bore... we have experience on target impact keyholes, but the chamber pressure is OK.
The worst combination is firing 9x19mm cartridge from a 7.63mm pistol. Chamber pressure is super high. So, a big Red "9" on panels could help.
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