I carry my .22 pistol (Ruger SR22). I figure a sidearm for hunting is really only useful for coup de grace headshots, you will use your rifle for self defense if you need to. Loaded with stingers so I don't have to worry about the round penetrating and ricocheting off a rock as much.
For finishing off a wounded animal, a .22 is good because most people can shoot them more accurately and get the headshot and the chance of ricochet is much lower.