Welcome to the Rohrbaugh Forum, hk_mtbr;
I've been reloading for my R9s for the past few months with good results.  100% reliable feeding & extracting, 100% reliable ignition.
I've been using primarily Winchester and Remington brass; CCI 500 primers; Berry's 115 grain bullets; starting loads of Unique, Universal Clays, Power Pistol, HS-6.  I like the Hogdon HS-6 the best because it generates very little flash.  (Power Pistol is a good powder, but the worst from a muzzle flash standpoint.)
From a lot of reading on the 9mm cartridge, I wanted to be very careful to not compress the charge.  So I measured O.A.L of a  115 gr Winchester White Box round, disassembled the round & measured bullet length.  Then I adjusted O.A.L. of the rounds I was assembling by the difference between the Berry's and Winchester bullet lengths.
The adjusted O.A.L. of my handloads fell within the range recommended in several of my reloading manuals.  100% function at the range was proof of the pudding.
Steve