So I bought my Rohrbaugh R9S today.  Very nice gun.
I took it into the range.  Very Excited.
I shot 50 rounds of Remington UMC through it, and by the end of it I was flinching at every shot because every third shot didn't fire (at all).  I would try a second pull of the trigger, and still nothing.  So I eject it and go on to the next, which may or may not fire.  The non-fired rounds had a small, but very light, mark where the firing pin hit them, but were obviously not fired.  I put them in my Glock, and every one of them fired fine.
The guys at the range tell me that the UMC is a very hard primer, so I shot 50 rounds of reloads they had, and most of them fired.  They keyholed very badly, but they fired.
Then I put 20 rounds of PMC Starfire HP through it, and every single one fired without a problem.
Question is: Is this normal?
Should I only ever put the $1 per round ammo through this gun?  Or is something wrong with it, and I should send it back to Rohrbaugh to have them adjust it?
-Steve