I started out useing a S&W model 19 357 as the back up to my knife when I started hunting hogs on my own 14 yrs ago. I got rid of it as soon as I could, and got a 44 mag. I have seen hogs of all sizes killed with .38, .357 mag, 40 S&W, 44mag, 45acp, and 45LC. Of all of these rounds if I had to choose one it would be the 44 mag hands down in revolvers. If I had only semi's to choose from the 40 would be my choice. I have seen more hogs shot DRT with a 40 then any other semi round. While they all will work with correct shot placement, I want a round I can count on and feel comfortable with at all times. If you put your shots where you want them, with any of your handguns, then use what round your more comfortable with.
Just one last thing to think about, and the reason I do not carry a semi when hog hunting as I have seen it happen. If you slip in mudd or trip, what ever the case maybe when hunting or looking for a wounded hog. Can you depend on your semi to work with mud, water, dirt, etc.. on it? I have seen even Glock Semi's jam and refuse to fire in situations like that. Where as I have yet to have a revolver do it. JMHO.