I'm no big fan of hardcast bullets. They punch a tiny little hole, don't do much tissue damage, and the animal has to bleed out through that small hole which can take a while. Not a whole lot more effective than an arrow.

But, this is perhaps the one case where I would consider them, seeing that hogs have a thick gristle pad that you have to get through to reach some vitals. I don't see the .357 as a great 'bone breaker', but if anything will break a bone, a hardcast will. The usual for the .357 is 180 grain.

Try some other stuff too (like Hornady XTP), and let us know how it works!