Everyone’s friend, the Professional Russian, demonstrates the power of several handguns ranging from a 9mm to a 357 Magnum by shooting one gallon jugs of water. Its easy to get a clear feel for the amount of power these weapons possess from this sort of demonstration, and frankly it’s just fascinating to watch thing basically blowing up.
As always, guns are dangerous. I do not recommend you try anything like this at home. Or anywhere for that matter.