The arguments about handgun caliber invariably conclude with the statement that the placement of the shots counts. This remains until the bullet can no longer hit something that will effectively close the system down.
It is due to this that serious testing culture continues to revert toward 12 to 18 inches of penetration in calibrated gel as an effective yardstick. Neither is it magic, nor does it predict stopping power. A sanity check is to determine that a cartridge is deep enough to be visible beyond heavy clothing, an arm in the field or a non-square angle.
1. .22 Short
22 Short is always used in small revolvers and in old-fashioned pocket guns since it is easy to handle and easy to keep locked up. The comparison is in low recoil and non-obtrusive blast, which makes it palatable, and large cartridges of featherweight handguns punish the shooters.
The defensive issue with it is easy, there is not a lot of bullet to play with. The low-velocity light projectiles can easily lose their penetration when subjected to the resistance of clothing, bone, or an angled course. When even the placement is considered good, the cartridge leaves very little margin to the shot that is propelled through an arm, shoulder, or a diagonal line, into the torso.
2. .25 ACP
25 ACP was intended to be used in small autos that required to be dependable on centerfire but could fit in a pocket. This centerfire ignition advantage is not imaginary, particularly against rimfire ones in micro pistols.
It is short barrel trade performance terminal. In pocket-caliber space, depth is inclined to creep close to the floor and any significant enlargement is likely to cost penetration of which the cartridge can do with none. Barriers and awkward angles make maybe enough not enough very quickly when the underlying is already thin.
3. .32 S&W (Original)
The historic 32 S&W is a workhorse of the past that was safe in the times of small revolvers and small ambitions. It is light shooting, and that lightness is one of the reasons why it lingered so long.
Currently defensive demands are more demanding. The cartridge has low ballistics which restrict its capability to continue driving in instances where the route to vitals is not straight. It is also overshadowed by subsequent rounds in the .32-family that can offer much higher velocity and hits with significantly higher potential penetration, and the original version is in practice a why accept less? choice.
4. .410 Bore From a Handgun
.410 platforms in the form of handguns carry a strong suggestion: there are several projectiles, and a loose pattern at close sight. At the tip of the muzzle, the payload appears as though it will fix issues in a short time.
When you have short barrels, things become different. Velocity is reduced, projectile energy per pellet remains low and patterns can open at a rate that is fast enough to defeat accountability. Certain buckshot loads may seem satisfactory in a perfect media, but become unreliable when we start adding clothes and the reality of variation. The system tends to sacrifice depth with dispersion and depth is what a handgun will never be able to imitate.
5. .22 LR (When Used for Defense)
22 LR is in every corner, and it has its fame of a low recoil rate and rapid follow-up shots. It can also provide high capacity in a very small footprint in small pistols.
Its weak points are reliability and depth. Rimfire ignition is still already a proven weakness over centerfire, and short barrels may only penetrate marginally based on load. Heavy-clothing protocols upon which testing culture relies greatly, such as four-layer heavy clothing barriers, are due to such reasons as being able to alter the way bullets travel and narrow the margin of error, even further.
6. .380 ACP (FMJ Specifically)
380 ACP borders on the verge of being the lowest minimum viable on most shooters, particularly even short-hand pistols. And it is precisely because the choice of ammunition is a consideration here, where it is not in larger service calibers.
Full metal jacket has been used to assure penetration, but it has its share of its own ills: a tight wound track and more probability of exiting without necessarily making much of a mess on the passage through. The classic split is .380, which when tested in heavy clothing gel penetration on a standard split, either penetrated with minimal expansion, or otherwise bled off the depth required to remain within the 1218 inch window. FMJ is able to feed well though not a shortcut to reliable terminal effect.
7. .45 GAP
45 GAP is not a weak cartridge, as such. It was designed to fit the performance of a .45 caliber in a shorter case length to fit smaller grip frame duty sizes.
It has a weakness of assistance and not ballistics. Less prevalent mainstream platforms, less prevalent common defensive loadings, and this results in less redundancy and less broad-based validation than the dominant service calibers. Where an ecosystem of a cartridge remains thin, long-term testing, the presence of tried loads, and institutional inertia all tend to be concentrated elsewhere.
All of these cartridges are not innocuous. The practical question is whether or not they provide an adequate margin of performance when the shot is not clean, the angle is incorrect or the target is partially obscured.
Blastastic gel is not ballistic, it is the element that drives a profitable practice: when a cart can hardly penetrate sufficiently in controlled circumstances, it carries even less buffer when the elements of reality pile upon one another.
