No such thing as a 22mm pistol - anything 20mm and above is considered a cannon, anyhow.
You're probably thinking of a .22 pistol, which is .22 inches (although the diameter of the projectile is actually .223 inches).
As for which is better, what are your needs? If you just want something to plink with, I'd recommend the .22. If you want something for self defence, then definitely the 9mm.
Each cartridge could be the more damaging one in specific scenarios. As far as which cartridge generates more force, has a larger crush cavity, and can expand further, the .40.
No. The 9mm is not compatible with the .40 caliber frame/slide. On the other hand, you can put a .357 SIG barrel into a Glock 22 and use your .40 magazines.
I'm not entirely sure about the .32 caliber, but the 9mm and .40cal P99QA/P99AS runs for about $740 US
The .40 caliber typically has greater knockdown power than the 9mm due to its larger bullet diameter and heavier weight, resulting in more energy transfer upon impact. While the 9mm is effective and has less recoil, allowing for faster follow-up shots, the .40 caliber is often preferred for its stopping power in self-defense situations. However, the effectiveness of either caliber can also depend on factors like bullet design and shot placement.
No, a .40 caliber magazine cannot fit 9mm ammunition. The .40 S&W and 9mm cartridges have different dimensions and are designed for different firearms. While some firearms may be able to use interchangeable magazines, this is specific to certain models and not a general compatibility between the two calibers. Always consult the manufacturer's specifications for compatibility.
For the AVERAGE 9mm pistol, not very well. The M9 pistol is considered to have an effective range of 50 meters. There ARE 9mm pistols and shooters that are accurate to 100 yards- but not an everyday affair.
Both can be equally accurate
H&K claims their pistols to be the most accurate out of the box. This has been disputed.
.38 Special- 9mm is more powerful. ,357 Magnum- 9mm is less powerful.
Either the SIG or S&W
No. There are more than a dozen DIFFERENT "9mm" cartridges, and they do not interchange. The most common is 9mm Parabellum- also known as 9mm Luger or 9x19. It does NOT interchange with 9mm Kurz, 9mm Corto, 9mm Makarov, 9mm Ultra, etc.
9mm