That's the reason that the "Wonder Nines" that came out in the late '70's and early '80's were built like tanks. they all were designed to fire NATO spec 9mm.
Oh come on now ... the only 9MM in the world to handle it and survive ??? Geez I know you guys love your Ruger semis, but some of these statements are just ridiculous .... There's not a Sig, CZ, or Glock 9MM that wouldn't survive ANYTHING a Ruger did. THe P89 is a stout platform, agreed, but so are the rest of the so-called 'Wonder 9's'. Let's try to be just a little bit reasonable ...
I think part of the issue is 'what the manufacturer of the gun says' they are going to try and limit what ever you shoot in it for liability reasons... believe me, if a gun blows up or even just the slide cracks they want to try and figure out what 'YOU" did wrong to cause it... just corporate nature.