Hmmm... 6 rounds, one fails to fire, so I'm down to 5... or my XDm-9 with 20 rounds, one fails to fire I'm down to 19... I think I'll stick with the XDm .For self defense I would Tap, Rack, Assess. As others have said there's no use in trying a round again.
Or
You could just carry a real gun (Wheelgun). In which case, if you have a round that doesn't light all you have to do is pull the trigger again.