Some folks in East Texas and Louisiana hunt hogs with a bowie knife, it is effective for them as they do kill hogs. That would not be my choice, neither would the .30 carbine. I agree, it is better than a sharp stick, but not by far.
I am not knocking benjaminw7525, but from his post, I am of the opinion that he is a young, and somewhat inexperienced hunter. If this is, in fact, the case, I would not recommend the .30 carbine at all. First, it is a poor choice, even for an experienced hunter, and secondly, it is not the gun a limited experienced hunter needs to gain the expertise in successfully taking game.
I have taken all kinds of game with a .22, from deer to rabbits, but I never attempted a deer or hog until I had a lot of experience with the gun, knew my limitations, the limitations of the gun, and the game I was hunting. I am not as steady as I once was, so today I prefer something a little bigger, with a good scope, and only try to make a heart/lung shot. Does a 7mm mag sound too big?