Hogs are typically tougher to bring down than deer and we've shot many with the 22WMR. We usually use CCI 40g HPs, but the Federal 50g HPs are good as well. With neck or base of ear shots they are DRT. Rib/lungs penetrates enough to kill them as well, but they can run quite far and blood is usually nill.
I'm in agreement with others about loading down a larger cartridge, just be sure to use a projectile that's suited for lower Vs(Varmint bullets typically behave well).
Another option is a light loaded MLer. I once had a CVA that shot poorly with most pills, but shot surprisingly well with a cast 240g pill in a Hdy sabot over only 50g of 2F Pyrodex. It had very little recoil, a low report, and penetrated ridiculously well.
