357 sig in HP is the way to go for all situations. Too many people think that BG just stands there and shoots, but human nature (unless he is all doped up) is to hide behind something and shoot when projectiles are coming back at you. It is just a reflex to make yourself as small as possible. And just like you he will not stop shooting and run away till he runs out of ammo. 357 Sig can reach around most corners (concrete or rock excluded).
I doubt this is the case. Most bad guys arent prepared for the idea that someone will be firing back.