To date I have literally killed tons of feral hogs. <y favorite firearm to use is my Ruger Compact in .308. Why, because it works up close and fast, like literally right at your feet, or out to around 400+yards with a good rest.
All that said, I have also used a dozen other calibers which included both the M1 Carbine rifle and my Blackhawk revolver. Shot placement on a hog is paramount if you want it to drop at the shot. Most folks shoot them like a deer which is too far back, and usually right through the stomach, which they will soak up and leave little trial with. My close friend has dumped over a hundred using his little 17 Rem as well with carefully picked shots. They simply fold up the landing gear and roll over when they hit the ground.
We shoot straight up the front leg and about 3" up from their belly line, or for a head shot. In most cases either of these will put them down in short order, if not on the spot.
This past year during the week of Christmas my grandson and I were sitting overlooking our back pasture. We had a feeder up behind us maybe 40yds away, and this boar comes right up 15 feet behind us cutting across the lower portion of the hill we were sitting on. I only had time to draw and fire my Redhawk 45 Colt, but I hit him square through the side hard enough with the 280gr WFN to spin him around before I put another one through him. We both saw the initial hit was a bit back as the something white was hanging out the 2" or so wide hole the bullet left. None the less he soaked them both up and left no trail to be followed through the underbrush. We did find him several hours later due to the congregation of the clean up crew, but he was so far up under a fallen tree they couldn't even get in to get to him.
So, yes the 30 Carbine WILL work on hogs, my BH has half a dozen weighing from 25'ish pounds up to around 180 pounds to it's credit. Will it work every time? if the shot is placed where it should be, and the range is short it should. But, things don't always go as planned, but like mentioned above and in the other post, when that happens, usually bigger doesn't work either.