I remember seeing a law enforcement study that said on average it required 2 hits to subdue most humans. In a real life situation most trained professionals would miss their moving target a little more than 60%. So you figure about 6 shots to hit your target the required number of times to subdue or kill. Since most people are not trained professionals nor have they been in real life gun fights odds would say you might need more than 8 especially of there is
More than one assailant. IMO.