People normally shoot a revolver better then a double action gun. I have one that happens to hold 7 rounds so that is plenty imo. Honestly if it is just for home defense I suggest a shotgun. Anything bullet bigger then 22LR shot inside a house has a chance to fly out of the house and into neighbors. Having hollow point bullets will not over penetrate a body but that is only if you hit them and not miss.
Shotgun = home defense