One Shot Stops, 9mm vs. .45, Magic Bullet. READ MORE

Bob Campbell

In writing, I prefer my information to be valid and the research verifiable, and the experiments repeatable. I like to give the reader an opportunity to get a handle on things. Quite often the things that the critic points out harshly are the things that majority of the readers find valuable. I have found that the subject of handgun wound potential or stopping power isnt a puzzle at all but remains a puzzle to those that make it so. I realize that there is not natural law that gives a man a reward that matches his endeavor, so I hope that the reader finds something of value in this work. There has been more debate concerning handgun stopping power in the past 20 years than in the previous 100. A lot of gunplay took place in the old west, but period literature covers the tactics and personalities far more closely than the guns and calibers used. The .44 and .45 caliber revolvers in wide use on the frontier seemed to work with authority, and no one much questioned the efficacy of their ballistics. There are reports of the effect of the .44 on horses and the problems with the .36 at long range during the Civil War, but perhaps that is going back too far and reading too much into different technology.

Since the days when word-of-mouth was the only barometer of handgun effectiveness, we have made many advances in measuring handgun power. The standard was once pine boards to test handgun cartridges, penetration being the only criteria. Penetration is still the most important criteria. Ductseal and clay were widely used to test hollowpoints, both unrealistic media. Today we have carefully formulated ballistic gelatin, developed by trauma surgeons to replicate human tissue, as well as some highly significant scientific studies of gunshot effects.

The study of tactics and human behavior is more important than the weapon, caliber and loading used in combat. Marksmanship can be proven to be the most important component of handgun effectiveness. Wound ballistics is a science, with conclusions drawn from studying bullet tracks in both ballistic gelatin and corpses in the medical examiner’s morgue. Detractors of laboratory tests feel these tests cannot duplicate differences in point of impact, clothing, attitude, muscle structure and intoxication. But a ballistic scientist does not ask us to believe anything. He simply presents the results of his tests. The results are not only verifiable, they are repeatable, the real test of science.

Stopping power “studies,” on the other hand, ask us to believe in someone’s conclusion. Assuming such compilations are valid requires a considerable leap of faith. Reports are often sensationalized, even glamorized. Are such studies grounded in reality? Are they even useful? Can they be supported by scientific methods? I don’t have all the answers, but I do know this — cartridges and loads are not as important as basic shooting skills. I don’t believe trick loads significantly alter the ability of a smallbore cartridge to inflict damage. I simply don’t accept many published reports because they are anecdotal and based on hearsay. Even if the shootings actually occurred — which is reasonable to ask — the methodology is flawed. In other cases, there are conclusions made that are so irrelevant to the reality of interpersonal combat that they are not even worth publishing.

A Skeptical Eye
When it comes to the various handgun “studies,” we must consider their validity. These “researchers” are not writing the King James version of stopping power. Yet the figures expressed are often quoted in the popular press as gospel. A criticism of some of the work might be the inability of others to inspect and review source material. To some, this reduces the validity of the study to zero. Certainly, such unsubstantiated work does not meet an investigative standard. As a longtime officer, I understand both sides of this debate. Confidentiality and respect for families must be considered. Cops who collect shooting histories may not have engaged in much gunplay, but have arrived just after quite a few gunfights ended. Cops from Area Six in Chicago, Fort Apache (the Bronx) in New York, or The Wall in California have a good idea of the type of damage different handgun calibers inflict. They are good investigators as well. They realize that three eyewitnesses testifying in good faith may perceive events three different ways.

Human perceptions differ. The road to a detective’s badge in many agencies is through the traffic division. Working wreck scenes is small-scale investigation, and separates the sleuths from the duffers in some cases. Applying normal investigative standards to stopping power studies often reveals bankrupt methodology or standards. These “studies” do not even meet the criteria demanded by some agencies in ascertaining who is at fault in a fender bender.

Most police trainers have long abandoned the attempt to study stopping power and instead have concentrated on tactical movement and the actions of felons in combat. Tactics carry the day. By criticizing issue arms and equipment, we undermine an officer’s confidence in his gear, something he is usually unable to change. Sure, a DAO 9mm loaded with subsonic ammunition is not my first choice but a good man or woman behind the sights can make a difference. Tactics and marksmanship are a better answer than hotter loads in minor calibers.

One writer did the boys and girls in blue no favor when he stated in pat terms that load selection is more important than shot placement. His reasoning was that we can control load selection, but not marksmanship. Evidently he does not realize that shots that do not find critical areas are relatively ineffective. Any hunter knows better, and hunting lessons do indeed translate to self defense. A gut-shot man behaves just like a gut-shot deer — both are up and running for quite some time. A man and a deer are similar in size and may be about as hard to put down. The man knows he has been shot, the deer does not, and men are more susceptible to shock.

Most studies, or rather I call them published opinions, eliminate multiple bullet strikes from the data as they ‘confuse the issue.’ This simply makes small caliber bullets look much better than real world experience would indicate. Most handgun fights will be multiple strike incidents. One shot failures would be rare. After all, if the first shot fails, won’t you fire another? Besides, trained shooters often fire double or triple taps before a subject can fall. A problem with handgun histories is qualifying hits. I have on hand a report from police sources in which a coroner and a medical examiner, both reputable men, disagreed concerning the number of hits on a felon’s body. In a class I once attended, a medical examiner spoke in glowing terms of a certain new generation hollowpoint. He showed an impressive slide in which a bad guy — “Satan Lives” was tattooed on his chest — took a single hit which produced a long and wide wound track. Years later, the officer involved in the incident spoke at a seminar. He noted the man took the shot, stopped his attack, and remained mobile for some time, asking the officer to call an ambulance. The felon expired. The officer was certain the man could have continued the fight had he so wished. Two conflicting opinions on the same shooting. Some adversaries are “machinegunned” in shootings — five .38s, seven .45s, or 41 9mms. Excited, frightened men empty their guns under deadly stress. If the felon goes down in such a volley, it may have been a one-shot stop. The volley that leaves a felon standing is always a failure to stop. Dismissing multiple hits eliminates the majority of smallbore shootings.

There are three components of wound potential that must be stressed — marksmanship, marksmanship and marksmanship. We are not very bright if we have time to arm ourselves with a long gun and fail to do so. In comparison to a 12 gauge shotgun or a .223 rifle, the “weak .38” and “strong .45” are more alike than they differ. A sobering thought.

Tactical Info
Shooting histories should be used for tactical information first and bullet performance information second. As for lab work, gelatin is homogenous and flesh and blood are heterogeneous. It is not the same, but gelatin is a good media for comparing bullet performance. What counts is point of impact and perhaps the adversary’s tox sheet. (Certain drugs are not called painkillers for nothing.) Even ordinary water is good for comparing bullet expansion and penetration. Whether or not we regard the studies as valid, one rule we may take away from learned research is that bullet selection is more important in the weaker calibers. One authority, Dr. Vincent J. Di Miao, has stated that perhaps half of all handgun bullets designed to expand actually fail to expand in the body. They strike a portion of the body that doesn’t stop the bullet or they strike bone and close up on the nose. The works of this respected medical examiner do not inspire confidence in smallbore hollowpoints. We are led to the conclusion that all handguns are weak instruments.

Some decades ago the Police Marksman’s Association published a study that I found among the more valid of the day. The calibers included were .38 Special, 9mm Luger, .357 Magnum and .45 ACP. The .40 S & W was yet to come, so, yes, this was some time ago. While the results of the study are valid, the study, which was conducted by a respected researcher and the records were available to interested researchers, also included hit probability. This simply reflected the number of hits per shots fired. This was a reflection on training than anything else but notably the .357 Magnum exhibited the highest hit probability. The .45 auto and .357 Magnum revolvers showed the highest hit probability of any service handguns. Hit probability is a side issue, but one which remains valid. You would imagine if the agency has a hit probability of fifty per cent with the 9mm, the shots that hit are probably not well centered. Some agencies, such as the Kentucky State Patrol, engaged in rigorous training with their Magnum revolvers.

What follows is a divergence from the scientific, but bear with me — life has to have some fun too — and all this about combat reminds us that life is what it is because men live it.

Fun With Math
One “study” shows a 9mm cartridge that has proven to be a 50 percent stopper. Hit probability in this agency has proven to be 50 percent — far higher than average at the time. What are the chances two felons will be stopped with two shots? Given that only one out of two rounds will hit Felon X and Felon Y, at least four shots will have to be fired to connect, and then only one opponent is likely to be stopped.

Here’s the math on that probability: .50 x .50 = .25. What you have is a one-in-four chance of stopping Felon X with one shot.

What about the .357 Magnum revolver, per PMA stats? It works out like this: .75 x .60 = .45. The conclusion, if we were peddling this “study” as a major work, would be this: The .357 Magnum is nearly twice as likely to produce a one-shot stop as a 9mm Luger. So there you have it. How much faith can we put in these studies? We can learn from the PMA study that firing less with more accuracy means a lot. That doesn’t mean we are slower to the first shot but we should fire with greater accuracy.

The Answer
What stops human adversaries during a deadly attack? A brain shot or a spine shot are the only two instant stoppers. Damage to blood bearing organs which causes rapid blood loss and a drop of pressure causes the body to shut down. Common sense is the best guide. Bigger bullets cause more damage. Bigger knives cut better. Bigger engines pull better. However, handgun bullets aren’t very big. We should practice with the largest caliber we are able to control. Accuracy can make up for power. The reverse may not be true.