Story and photographs by John Johnston of BaLLISTIC RADIO
Here’s why using 9mm ammo for personal defense is a good choice:
It’s Cheap (Before Covid)
When I used to work at a gun store I was frequently asked what caliber was best for any given situation. It would have been nice if there had been some sort of magic death ray that I could have suggested, but there isn’t, and most people have a pretty flawed understanding of what actually happens when a bullet interacts with a human target. For starters let’s examine a couple of concepts that don’t actually exist in the scientific world but everyone talks about anyway. I’m going to regurgitate the work from those better than myself, and the information is worth paying attention to.
This doesn’t actually exist. If a bullet had enough force to knock down an individual, it would also knock down the individual firing the gun. People do not go flying through the air when hit by a bullet, contrary to what the movies and television would have us believe. Newton’s Third Law and all.
ENERGY DUMP On the back of a box of ammo, manufacturers list the foot-pounds of energy (ft-lbf, or foot-pounds of force/energy) that their rounds have. Well, that doesn’t actually matter. The terminal performance of a projectile is determined solely by how much tissue it cuts, crushes or tears. While it has been advocated by many-a-misinformed-gun-counter commando that some sort of energy transfer occurs between a projectile and its target, this has been rejected by everyone I respect who studies terminal ballistics for a living.
9MM IS FOR GIRLS AND SISSIES
How often have you heard, “If you’re not carrying a caliber that begins with the number four and ends with the number five, you’re doing it wrong”? This almost makes sense if we were limited to nonexpanding ammunition, but most of us aren’t. When we compare modern hollow-point rounds in popular service calibers, there is, on average, one-tenth of an inch of difference in expanded diameter between a 9mm and a .45ACP. Grab a ruler and look at a tenth of an inch. It doesn’t seem like much, does it? That’s because it’s not.
In autopsies of gunshot-wound victims, the wound track created by a 9mm is indistinguishable from that created by a .45ACP.
The only advantage that a larger caliber is going to offer you, in my mind, is slightly better performance through intermediate barriers. Probably one of the more commonly encountered intermediate barriers is the front or rear windshield of a car. That’s not to say that the smaller caliber doesn’t perform well through those same barriers; it’s just that the larger ones perform only slightly better. Tempered auto glass has a nasty tendency to deflect bullets from their original course, as well as separate metal jackets from their lead-core bullets. It’s for this reason that .40S&W gained so much popularity in law-enforcement circles during the early 1990s.
The nice thing is, with modern designs, most service ammunition is going to perform pretty well through barriers, and it is for this reason that a lot of larger law enforcement departments are switching back to or have been using 9mm all along. Some notable examples are the NYPD and my very own Cincinnati Police Department, which is using the 9mm 147-grain Ranger T series fired from their Smith and Wesson M&P9s. The PDX1 Bonded ammo line is the civilian version of this round with the only difference being price.
So, since I’m happy with the 9mm’s performance through barriers, and all handgun calibers suck anyway (editor’s disclaimer: the views of the author are not necessarily the views of the world at large but his determination, confidence and delivery is inspiring), here is why I like 9mm:
“Damn, I wish I hadn’t had so much ammo” is not something I’ve ever known anyone in a gunfight to say after the fact. The phrase “If you can’t get it done in six, then it ain’t gettin’ done” is asinine, and something that I hear so often it makes me want to rip out what remaining hair I have. None of us are mind readers, and if we could predict beforehand how many rounds we would need to stop a threat, then why the hell wouldn’t we just avoid the threat entirely in the first place? More rounds are a good thing; if you think differently, I’m going to have to politely disagree with you, and think nasty thoughts quietly to myself.
Can I shoot a .40 or .45 as quickly as I can a 9mm? Sure I can. Can I shoot a .40 or .45 as quickly and accurately as I can a 9mm? I wish I could. There are some people who can, but I’m not one of them. Whether I’m shooting strong or weak hand, my accuracy only gets worse. In every force-on-force exercise that I have ever participated in, someone always seems to get shot in the hand. So with that in mind, being able to put rounds on a target quickly with one hand seems important to me.
IT’S CHEAP! (Before Covid)
Nine millimeter ammunition is cheaper than any of the other service calibers. Cheaper equals more ammo. More ammo equals more practice, and obviously more practice equals awesome. Since I’m a fan of awesome, it all works out pretty well for me.
Even the FBI have made the decision to go to the 9mm rounds for all of its agents. Reasonings are similar to what this article have mentioned. (accuracy, penetration, etc..)
So there you go, the logic behind why I’ve chosen 9mm as my preferred handgun caliber. Obviously the choices you make are going to be determined by your circumstances and personal preferences, but hey, at least you know why 9mm gives me the warm and fuzzies that is does. For a more detailed and intelligent take on this subject, check out Service Caliber Handgun Duty and Self-Defense Ammo by Dr. Gary Roberts. AmSJ
Editor’s note: John Johnston is the owner and host of Ballistic Radio, a weekly show and podcast dedicated to topics about self-defense, firearms and training with a touch of humor thrown in for good measure.