Way to slip something in, as this thread was clearly going to become political in an instant (and it did).
I have no way of knowing for sure, since I don't own a C-96 (only a Tokarev). But I've shot both Yugo and Romanian Tok, and some Fiocchi (I think, might have been PPU) 7.63... the 7.63 was noticeably softer.
I've also looked at new-manufactured boxes of both, and the factory Tok was listed with a lot higher FPS.
When it comes to non-political gun myths, I'd say STEEL-CASED AMMO WILL RUIN A GOOD GUN is up there. I've shot steel in 9mm, .223, .45acp, .308, and other calibers, and those guns all continue to run fine, with no damage.