Here is a weird thing about the R9, Carl Rohrbaugh recommends using the Federal 105gr Guard Dog EFMJ.
That is strange to me because usually when people have trouble with the R9 you find they're using 115gr something or other, and the solution that you often hear on the forum is to use 124gr Gold Dots.
The first 100 rounds I fired through my R9 were 124gr Gold Dots because I wanted zero problems with the gun if possible.
I really freak out when my carry gun has a problem. I obsess about it.
I was on GlockTalk and this guy was having trouble with his 17L... yes trouble with a Glock (sort of). He didn't clean it before taking it to the range, he was using all sorts of crap ammo of different types and weights. When people told him to take it apart, clean it and lube it - he wouldn't He was hell bent on firing it without cleaning it. I didn't know what he was going to do, change out parts before cleaning and lubing it? It was like he was on a mission to prove the Glock can take anything. I'm not bashing Glock - mine run like champs, I'm just saying what is it about people who think that something like that proves anything. That's like putting sugar in your gas tank and driving your car like that so you can brag to people what a tough car you have.
Well anyway I'm not like that, and I really freak out when my carry gun has a problem so I want everything to go perfectly. And since most people on the Rohrbaugh forum reported the most success with and least problems with 124gr Gold Dots - that's all I shot through my R9 for the first 100 rounds.
I would think that since some people have problems with 115gr ammo, you'd have more problems with 105gr ammo. But Carl Rohrbaugh says they work great in the R9.
I wouldn't use that ammo anyway since the tests that I've seen of the Guard Dog show it to perform about like a 380 AUTO does -10 or so inches of penetration in bare gel, a little less through the 4 ply denim test. Although I haven't seen it tested out of a 3" barrel... Out of a Glock 19 the 105gr Guard Dog acts like a 380 AUTO.
A 9mm minus P round might sell to some people. Especially if there are guns that will cycle 9mm -P. Well actually, I think anyone who bought the DoubleTap Defense Double Tap in 9mm would be interested in loading it with -P ammo.
Heck, someone might even manufacture a semi auto designed specifically to fire 9mm -P ammo.