I just tried some 115 gr. Silvertips in my R9, and I had several light strikes, where it looked like the primer was barely touched, if at all. Most of the rounds fired properly, but this definitely rules out Silvertips for me in my R9. The gun was fully cleaned and lubed, and had only fired about 2 magazines before the first light strikes started happening.
I then fired all the "light strike" rounds in my PM9 with no trouble, and it left good, solid hits in the primers.
Anyone else encounter hard primers in Silvertips? Or could this be an issue of a weak hammer spring in my R9?
I'll only shoot Gold Dots in my R9 from now on. So far, it's the only thing that's been reliable.