I would say 8 shots could be enough but in certain situation it won't be enough .Some are saying that most confrontations there are 3 shots fired in other words you are unlikely to need more. But the same people carry a firearm in case they need one the odds are that it is unlikely they will ever need to use a firearm. They also carry in con 1 in so they can get their firearm into action quicker even tough they are unlikely ever to need to use it.
PS I would carry it with a reload just in case.