Here's a chart with a bunch of different cartridges, by way of comparison:
The concept of "hit points" is a rough guide to how lethal the cartridge is likely to be. Hornady suggests that anything less than five hundred should be adequate to kill small game weighing about fifty pounds or less.
I think this reinforces my opinion that anything less than .38+P is too little, and anything greater than .357 Mag. is more than is necessary (particularly considering factors such as price and availability).