i use the 20 gauge Winchester Partition Gold slugs on hogs and they do a really good job. Two of those hogs went well over 300 pounds: Both bang flopped at the first shot.

For a lighter recoiling slug try the Winchester Platinum Tip sabot slugs. This bullet also weighs 260 grains but the velocity is down by 200 fps. The Platinum Tips have worked well on hogs for me too.