I generally shoot whatever out of my HK94...Finocci, Federal HP's, etc...all seems to run fine.
I personally eschew from +P and +P+, mostly because, well, it's a real HK94..I don't want to abuse it. I'll put 500 rounds through it in a session, but I don't like the idea of battering it more than it needs to be. I need to pick up a beater SW or something for that.