Dberg. I'm not a very good reference on ammo for the R9 as I only use Winchester 115 gr. Silvertips. I do, however, recommend it, as I have never had a flaw of any kind.
It works, and I don't want to chance a hiccup of any sort. Now, this is just my thoughts and for me. Everyone has to decide for themselves what they want to shoot and what works best for their R9.
You're on a good start. Continue to enjoy the little wonder.