ONE minor bullet wound in the arm or leg will do little to deter the bad guy,but SIX or SEVEN .380s in the chest should do it unless he's wearing a good vest.And I say don't be reluctant to shoot the bad guy shooter in the back if he has shot another person.Just take him down!
As a former LEO, I tell you most all our training was within 7 yards, as that is where most all shootings occur. Yes we did practice at 50 yds too but the chance of such a situation arrising is remote and I would leave gun fights at that range to anyone with a long gun. Furthermore, it is hard to demonstrate how someone at 50 yds is an immediate threat to you with a CCW.
At extremely close range, there may not be time to sight, so some proficiency must be developed for point shooting. Point of aim, 7 yrds, 15 yds or 50 yds was center mass. Put the front sight on center mass and fire, when not point shooting. With adrenalin running high, trying to hit someone in the head, or “wound” them, is almost an impossibility so don’t consider it.
I carry a 380 Bersa with 90 grain Corbon JHPs. These rounds are the equal of a 38 special fired from a 2 inch firearm. In my car I have a 40 glock model 23 with 135 Winchester lawman JHPs. 13 shots verses 8 in the Bersa.
On the job I never fired my weapon except during training over 30 years. Off the job, I have had to display a weapon twice to protect myself, no shots were fired but the mere presense stopped what I knew to be a developing bad situation for me.
In summary, carry a firearm you are familiar with through practice, know when to use it, and be certain you can put your rounds on target for two reasons: the first is the only effective rounds are those that land, the second is every one that misses has a lawyer attached to it.
Be safe, be aware.