Welcome to the Forum steve_of_jackson. I can only recommend Winchester 115 gr. Silvertips as these were recommended to me in mid March of '09 here on the Forum. I have never had a problem of any kind, so never tried anything else. Some R9s are finiky about what they are fed, so when the Winchester Silvertips worked, I was a happy camper. I don't like failures of any type, and I don't have any.
I stocked up before they became scarce. I do have Gold Dots, Golden Sabres, Hornady Critical Defense, and WWB, as back ups, but now will never have to use them.
Find what your R9 likes and stick with it. It's better for the R9 and you.