There is some 9mm ammo thats it's manufactures warn are for SMGs and should not be used in pistols. I had a lot of Israel UZI ammo befor that said right on the box not to shoot in pistols.
I have heard some Hirtenberger ammo imported was for SMGs and was way to hot for pistols, suposedly it was devoloped for extreame cold weather and was loaded hot so SMG would function better.
If it says on the box not for pistols I don't think I would shoot it in a pistol unless I had too. Realisticaly the chance of you finding this ammo it probably pretty low and probably shooting a few of them out of a quality modern 9mm would be OK...Things might would be different out of an old Luger, Broom Handle or even a cheap modern pistol
...I know that some old rounds like the 32 20 were loaded hotter for rifles and thier boxs will say for Rifles only, I wouldn't shoot them in a pistol.

I have had some military surplus 9mm that had very hard primers that while they shot fine in my Uzi SMG would have failue to fires in some of my pistols.
Once bought a 1,000 rounds of old Chinese 8mm to shoot in my Maxim MG, brought a Mauser rifle with me to try it out and shot fine so bought it.... None would fire in the Maxim because I guess the primers were to hard for it..Took it back and traded for some other and it shot fine....go figure

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