Like most R9, mine loves the Gold Dots. I will try to run through on mag per range trip of the good stuff. I've been using Remington UMC for my other range ammmo. I get this from Dick's Sporting Goods for $6.98/50 rds.
I had issues with the R9 when I bought it. I joined the Forum, changed the mag springs, bought new recoil springs, lubed it up, got a Hedley holster, and carbon fiber grips and now it's a sweet shooting baby. I carry it like my wallet.
The R9 hates the Remington UMC. FTF and Stovepipes all the time. Not a hiccup with the Gold Dots. Unfortunately, I cannot afford to fire exclusively Gold Dots.
So for the sake of my bank account what do you guys use for "range ammo" on the R9.