WEll from personal experience with some of the mid sized ones we get on most of the time, the .357 up thru the .44 has handled everything nicely. I have shot a couple using my 10 mm "Javilina", with mixed results. I firmly believe in the heavier bullets for the most part, however I am using the 200gr Remington JHP from my 41 with great results so far. I have seen a couple that I would have hated to tangle with up closer than 5 yds with those bullets though, haven't run across thm in the brush. I do believe that with the control of the Redhawk with those loads, I wouldn't have a problem delivering a stopping shot to the head.
With the .357 I have used the Remington 140 semi jacketed HP the 158gr JHP and the Oregon Trail 158gr FP all with decent one shot results. These were on pigs in the 100 - 150# class however.
In the 44mag, I have loaded for a couple of friends who have taken deer and a couple of hogs, using the 240gr Remington JHP. This bullet has been very accurate and once it hits, it unloads a whollop similar to the Wildcats. A co-worker tried some out on a retired vest his son-n-law had from his police duties. They hung it over a sheet of 3/4" plywood and then backed off 25yds. He said when it hit the vest, it flattened out to over 3/4" in dia, and blew out a 4" hole in the plywood.
For as much as I generally shoot my revolvers, I have found that the Remington bulk bullets do a great job on the critters we chase, and they are cheap enough that you can shoot plenty for practice.
I also have the 454 Ragin Bull, and some 260gr bullets which I haven't had the chance to try out on live game as of yet. Well I had the chance, but in the last minutes of the last remaining light, and black sights on a black hog, I ended up blowing the shot. What can I say, some do get lucky every once in a while.