Anyone thinking of owning or carrying a handgun for self defense should be well informed on the topic of stopping power. Stopping power is the ability of a firearm or other weapon to cause sufficient trauma to an adversary to immediately incapacitate (and thus stop) the target. This contrasts with lethality, in that stopping power pertains only to a weapon's ability to incapacitate quickly, regardless of whether death ultimately occurs.
In fact, the responsible gunowner, not being an assassin, should only be interested in how fast their weapon and ammunition stops their adversary from doing something deleterious to them or anyone they are trying to protect. They don't "shoot to kill", they shoot to stop.
The problem is the internet is filled with forums where people that know little or nothing either just voice their opinion or regurgitate something they have read. That makes it more difficult for the new gunowner, or the sport shooter who develops an interest in self protection to separate the wheat from the chaff. What follows is my take on what is accurate and factual, and what isn't.
There are a very limited number of studies, some ballistic testing by methodology, and a very few live tests on living beings. There are also cumulation studies of law enforcement and military incident reports, some of which are very well done. The ballistic testing is interesting but often flawed because of the way it was conducted. Here is an example:
Most manufacturers of cartridges publish data on the velocity of their ammunition. Many paid gun magazine writers often cross check and report on their findings as well. Unfortunately, the manufacturers almost always test with the longest barrel practical and rarely report the barrel length, making the data almost meaningless. If Winchester reports on their latest and greatest offering in .38 special with data obtained by firing the round through an eight inch barrel, and another manufacturer reports on data for their new .380 offering fired through a four inch barrel, the .38 special is going to look far better than the .380 as a choice for self defense.
The problem arises first when one considers that instead of an eight inch barrel, the reader is planning on a 2 1/2 inch barrel in their revolver, or a three inch barrel in their .380 instead of a four inch barrel. If the test had been done through the snub nosed revolver instead of an eight inch test barrel, the numbers would be significantly different and the .380 might have yielded superior numbers. This is often why conscientious gun magazine writers often redo tests through actual firearms that in a normal situation might actually be carried.
Another factor that must be considered is the gunowner's ability to actually use the firearm effectively. The recoil and muzzle blast from a J frame style .38 special when stoked with +P+ ammunition is truly terrifying to many gunowners and guaranteed to make their accuracy, techniques and speed less than it needs to be. I have owned several S&W model 36s and 60s in the past when small autos were less reliable and still own a Model 36 which is heavily engraved and gold filled which had never been fired and sits in a glass display case where it belongs.
With all of that said, velocity and ballistic gelatin penetration numbers are just that, numbers, and only a starting point to what is really important which is how many shots will it take to stop the evil doer from doing it to me? What follows are some of the basics.
Whether a person will be incapacitated (i.e. "stopped") when shot, depends on a large number of factors, including physical, physiological, and psychological effects. In considering these in the general, all are of equal importance.
When considering the physical effects on a person shot, much depends on where the bullet enters, passes through, and ends up. A bullet in the brain pan is almost always going to stop the person from continuing, but a torso hit which is where law enforcement officers are trained to aim for, may or may not be a "one shot stopper" depending on the areas damaged.
A heart hit will cause loss of pumping efficiency, loss of blood, and eventual cardiac arrest. A hole through the liver or lung will be similar, with the lung shot having the added effect of reducing blood oxygenation; these effects however are generally slower to arise than damage to the heart. Hitting the spinal cord will instantly interrupt the nerve signals to and from some or all extremities, disabling the target instantly.
Hitting the arm or leg will hit only muscle which causes a great deal of pain but is unlikely to be fatal, unless one of the large blood vessels (femoral or brachial arteries, for example) is also severed in the process, and equally unlikely to stop the person being shot if they are using drugs or drunk, or even just highly motivated to maim or kill you. Despite the old Westerns, trying to shoot someone in the arm or leg is not only a bad idea from the difficulty of marksmanship in a stressful situation point of view, it is also a bad idea when it comes to getting them to cease and desist.
Thus the tales of people being stopped with a single shot with a .22 LR and others surviving multiple chest wounds with a .44 magnum emerge to confuse people. Every experienced survivor of gun fights knows, or should know, that shot placement is just as important as the caliber and configuration of the bullet.
This is not to underplay, the importance of caliber and bullet configuration, because those things are also very important. It is more to point to the inadequacies and limitations of ballistic studies. No knowledgeable expert is going to deny that more penetration or expansion of a bullet is important. The FBI, after a major shootout disaster with epic public relations problems as a result in 1986 finally decided to learn more about calibers and bullet configurations. They conducted a massive study and came to these conclusions:
The FBI investigation placed partial blame for the agents' deaths on the lack of stopping power exhibited by their service handguns. Noting the difficulties of reloading a revolver while under fire, the FBI concluded that agents should be armed with semiautomatic handguns. (The agents were armed with three inch .38 special revolvers and three with S&W Model 459 9mm handguns. They also had, but were unable to deploy several Remington 870 shotguns.) One of the conclusions was that the 9mm was not effective enough, which is interesting because the latest FBI study indicated the 9mm is sufficient with "newer ammunition".
This of course adds to the confusion. Where once the FBI thought the right cartridge was a .45 ACP Federal Hyda Shock 230 grain, today they have backtracked to the 9mm. No wonder people are confused by ballistic studies.
It is important to note that the FBI decision was not based on stopping power however. It was based on a number of issues including the ability of the agents to handle a 9mm easier than a .40 or a .45 ACP, and that 9mm offered more rounds without reloading which they considered important because the average agent when engaged in an actual gunfight only hit the target 20-30% of the time.
Better, more extensive, and more realistic training might overcome both of those issues. For you, only you know if you can and will devote the time it takes to master the stress filled situation of a serious social situation and higher caliber handguns. Lets move on to other factors.
Another important factor in stopping power is
psychological in nature. Emotional shock, terror, or surprise can cause a person to faint, surrender, or flee when shot or shot at. Emotional fainting is the likely reason for most "one-shot stops", and not an intrinsic effectiveness quality of any firearm or bullet; police incident reports have documented situations where people have instantly dropped unconscious when the bullet only hit an extremity, or even completely missed. People react differently to pain, and for some, the pain accompanying a gun shot wound is enough for them to quit the fight. While not as reliable as true physical incapacitation, psychological reactions further confuse the conclusions of any studies on stopping power.
Here is a piece of information, those making decisions about what guns and what caliber to carry or use for self defense, can depend on. The holy grail of a one shot stop, every time, is a myth, no matter what handgun is being used unless shot placement causes a vital area to be affected. What can and does happen is the odds of stopping someone (usually with multiple connecting shots) go up as the caliber goes up.
Someone considering what gun and caliber to choose should try various firearms of various caliber to find the gun and caliber they feel they can comfortably master and can and will carry. If that is a .380 Seecamp so be it. As once becomes more comfortable with a gun, they might be able to "move up" in caliber to a 9mm, and maybe later yet to a .45 ACP. The really important thing is to be comfortable with the choice so that skills and tactics become the most important part of the training, rather than fighting with the gun or caliber choice.
Here are some thoughts for consideration:
- Elmer Keith preferred a hot .44 special in a .44 magnum revolver for defensive work;
- Jeff Cooper preferred the .45ACP in a 1911 style pistol until he "discovered" and profited from the 10MM Bren Ten;
- Bill Jordan preferred the .357 magnum in a S&W Model 19;
- Skeeter Skelton preferred the .44 special but often carried a .357 magnum;
- Many Navy Seals prefer .45 ACP in a semi automatic and select it on option over the standard military issue 9MM;
- FBI SWAT team members carry the .45 ACP in a semi automatic.