In the book, "Sixguns", Elmer Keith tells of a conversation with an old Union cavalry veteran, who killed a running hog with a .36 revolver. It can be done, if you are well aware of the capability of the gun. In the story as Keith related it, some foragers had flushed the hog and the cavalryman was trying to save them a little work. In other words, he had several men with .58 Springfields backing him up. Consider, the .36 shoots a round ball of about 80 grains at around 1,000 f/s, give or take. This is the equivalent of a .380 Auto. A .44 would be better, with a round ball of about 130 grains. This gets us all the way up to .38 Colt Auto level. I would be sure to be up a tree before the festivities started. Oh, and carry some spare balls and powder.