I have a feeling that a lot of people decide on their carry caliber by what they've seen in the movies or what a bunch of mall ninjas discussed after the fourth round of brews at the local watering hole. In the movies, the bad guys always drop after one shot and the good guys can tie an old rag around their wounds and wait a few hours for them to heal.
In the real world, pistol shooting victims usually die from bleeding and that can be a slow process. Pistol caliber bullets have to hit certain vital spots (e.g., the brain) in order to have an instant stop, and that can be difficult in a real situation. Even suicide attempts have a pretty significant failure rate.
Mouse guns (.22, .25, .32) are low powered, but more importantly the bullets aren't the most effective. Statistically, these pistols wound and kill a high percentage of victims because they are the hidden, Saturday Night Specials used by low-life druggies and robbers, and they tend to shoot at close range. Still, any weapon is better than no weapon at all.
Anything bigger than a mouse gun is in the range to be a good defensive pistol, as long as it's not so powerful that the shooter can't handle it. If you want to have a solid chance when you're forced into a bad situation, then you need to have practiced as much as possible, and that requires that you are shooting a cartridge that you can comfortably and consistently handle. That .44 magnum may be impressive in Dirty Harry movies, but if it's more than you can handle, it's a bad choice.
Actually, it's not just the cartridge, but the firearm as well. A good example is the Ruger LCP. Nice little pistol, easily concealable (even in Texas summer weather), very reliable, and available in .380 or 9 mm. But if you take it to the range and try to shoot a couple of hundred rounds for practice, you'll need to prepare an ice bath for your hand afterwards. It's not fun to shoot. I heard a woman who was shooting a .44 mag pistol tell someone she'd rather shoot it than the LCP. I don't know how much was real and how much was just bravado, but I don't think it's a stretch to agree that you're going to have the best chance with a pistol and cartridge that you can - and do - practice with on a regular basis.
In the real world, pistol shooting victims usually die from bleeding and that can be a slow process. Pistol caliber bullets have to hit certain vital spots (e.g., the brain) in order to have an instant stop, and that can be difficult in a real situation. Even suicide attempts have a pretty significant failure rate.
Mouse guns (.22, .25, .32) are low powered, but more importantly the bullets aren't the most effective. Statistically, these pistols wound and kill a high percentage of victims because they are the hidden, Saturday Night Specials used by low-life druggies and robbers, and they tend to shoot at close range. Still, any weapon is better than no weapon at all.
Anything bigger than a mouse gun is in the range to be a good defensive pistol, as long as it's not so powerful that the shooter can't handle it. If you want to have a solid chance when you're forced into a bad situation, then you need to have practiced as much as possible, and that requires that you are shooting a cartridge that you can comfortably and consistently handle. That .44 magnum may be impressive in Dirty Harry movies, but if it's more than you can handle, it's a bad choice.
Actually, it's not just the cartridge, but the firearm as well. A good example is the Ruger LCP. Nice little pistol, easily concealable (even in Texas summer weather), very reliable, and available in .380 or 9 mm. But if you take it to the range and try to shoot a couple of hundred rounds for practice, you'll need to prepare an ice bath for your hand afterwards. It's not fun to shoot. I heard a woman who was shooting a .44 mag pistol tell someone she'd rather shoot it than the LCP. I don't know how much was real and how much was just bravado, but I don't think it's a stretch to agree that you're going to have the best chance with a pistol and cartridge that you can - and do - practice with on a regular basis.