Am not denying it should be a neat little gun, and fun to shoot. It's just for the purposes described, there are better, more effective/efficient rounds and rifles already out there.
Also i find it very hard to believe that a light fast 115 grain hollow point at +P+ velocities would not be effective for small game.
Effective? Of course they will work, its just they are not AS efficient as you would expect. It is not JUST a matter of velocity. Or, at least not any velocity the 9mm can achieve.
The issue is the chosen target medium (small game) and the standard bullet construction of the 9mm Luger (optimized for use on humans). SMALL game (meaning coyote size and smaller) simply do not have the body mass or bone structure to reliably allow regular JHPs to expand, The 115gr HP +p+ that meets FBI standards etc. zips through small game without really noticing it is there.
And, when they don't expand, the RN profile used for good feeding in semi autos is the least effective bullet design, in terms of transmitting energy. The sharp shoulder of a (Keith style) SWC does a better job at "shocking" small game than a RN. THis is an observed effect, observed for generations now, but not something easily quantified to fit in a computer model. Note that the SWC shape does not guarantee success, only that it seems to work a bit better than a RN.
IF you had a specficially made "varmint" bullet for the 9mm, it would perform better, but as far as I know, such a bullet is not commercially made.
My point is, on small critters, (60lbs and under) varmints, pests, and food for the pot, a 9mm JHP is going to work just like a 9mm FMJ and using JHPs for rabbits, raccoons, skunks, etc simply spends money without significant benefits.
Bullet placement is what matters, yes, we say it all the time, but it really, really matters. SO does proper bullet construction, for the intended game.
I saw a fellow put 3 rounds of .357 158gr Win Luballoy SWC, from a Marlin carbine into a skunk. His aim was poor, and all three went in aft of the diaphragm, the first two having no visible effect, the third breaking the spine, taking out the back legs. At that point, the fellow asked me to finish the animal, which I did with a single .45Colt 250gr SWC to the head (I used the .45 because that is what I was wearing at the time. Otherwise, I would have gotten a .22)
He used the wrong bullet for the game, and he shot poorly. .357 Mag from a carbine, vs a skunk. NOT a matter of power, one of shot placement, again proving that what is not as important as where...