Thanks for the link, I totally missed the WWB review.
The 115gr rounds work for some people in the R9, but usually if a new person comes on the forum and is having feeding problems with their R9- they are trying to shoot something like 115gr Blazer Brass or similar and the recommendation is to go to 124gr Gold Dots.
I never even tried to shoot 115gr rounds in my R9, although I have a theory that if I put a worn-down spring that had been used for 200 rounds of 147gr shooting in the gun, the gun would probably cycle 115gr rounds. I have a feeling that 115gr cartridges might not cycle my R9 reliably when it has a brand-spanking new spring it but I could be wrong, I've never tried it.