I know there is an Ammunition sub-forum but it's 99.9% 223/556.
One of my 8" 9mm SBR is for HD/SD and as occasional truck gun duty. In my home I'm going to run 147gr Federal HST with suppressor; 25 yards would be pretty much the max. engagement distance and, god forbid, I ever had to engage someone in the house subsonic does have its appeal.
I started thinking about having a mag of supers along for the ride in our small RV where we might be doing some light off road and effectiveness at 100 yards has some appeal. Ran across
this article which includes better than anecdotal data. I know gel results can be somewhat controversial , but they do seem to have relative merit. At muzzle distances 124gr +P gets the nod versus 147gr just based on a bit more muzzle energy, but it looks as though if you can handle the hold over at longer distances the 147gr doesn't do all that badly. I'd be interested in what others think.
Edit: I should have added that Bryan mentioned I might need a tuning kit on hand. Shouldn't need one with my buffer setup but YMMV.