This was covered a little while back, here is the info.
 Re: Anyone reloading for the R9?
« Reply #1 on: Aug 7th, 2009, 8:29pm »  Quote  Modify  
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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 
John