Originally Posted by JonM
your going to get better performance just due purely to the longer barrel with standard loadings. hopefully your not thinking about hunting with it. even from a rifle the 9mm is barely sufficient for rabbit hunting.
If people successfully hunt with a 4" .357 revolver, one can hunt with a 9mm from a rifle, ESPECIALLY if handloading. There are factory loads that push a 125gr bullet to 1400fps out of a carbine, and they are still tayored for a pistol. Experimenting with powders that are a bit slower by one or two steps could increase the velocities even more. I wouldn't doubt one could get a 147gr bullet going at a good 1200fps or more with some fiddling.
I'm not saying they should be taking on 300lb game, because I know the .357 is still overall more capable but a 120lb deer isn't going to tell the difference between a .355 125gr bullet at 1400fps, and a .357 125gr bullet at 1400fps. Hell, I remember one guy took a deer with his 9mm carbine and the round went through both shoulder blades and stopped in the hide on the other side.
And I'd imagine any load within standard range designed to cycle an auto won't give you any trouble as far as the bullet getting stuck in the barrel. Turning it into a quiet "bolt-action" is where you might get into trouble, though I'd still see no point in loading light if you are wanting the velocity increase from a carbine.