So I think that settles it. 45 Derringer with an extra in your pocket will handle the situation.... but, on the other hand, don't get too hung up on magazine capacity. Remember the law of 3; armed altercations predominately happen at 3 yards distance, last only 3 seconds, and fire only 3 rounds... So go for the 45acp... even if it only holds 6 rounds, with a 45acp you only need one round