Since this thread is already all over the place...
On the caliber wars, particularly concerning pistol and revolver calibers:
I will be the first one to admit that I am an armchair general on this issue as I have not used pistols in real combat (or been in real combat for that matter. I hope that remains the case in the future as well.) but I have read my share of studies and "studies" on "stopping power."
The fact is that all the studies have to rely on guesswork or make up parameters since it is impossible to study the effectiveness of weapons on humans in laboratory quality experiments. Perhaps if we had Josef Mengele to help things would be different, but as it is we have to use material that is less relevant to real battle.
Still, the impression that I have gotten (and I admit that I may be wrong) is that hit location is the most important factor and honestly the differences in energy between 9mmPara, .40 S&W, .45ACP and the other most common calibers is quite small. With modern hollowpoints most values that can be measured are not that far from each other (with recoil and magazine capacity having some differences but modern pistols do have fairly large magazines for each caliber available.)
In the end, I seem to have the impression that the hit location is the number one deciding factor on the effect on live target and penetration comes in second. Everything else falls far behind (at least with pistols and revolvers.)
There are stories from shootouts where certain "gun" failed to stop a hostile person while another had a "one shot stop" but even then the location and ammo seem to be the factor in these.
If I had to choose one pistol to defend myself with I would pick one in 9mm caliber but that has more to do with the cheap ammo and large capacity magazines available than the actual "stopping power" in the gun. With cheap ammo I could afford to train more and with more training I would be better with the gun. I still wouldn't trust myself to shoot perfectly in a high stress situation so bigger magazine is a bonus and a manageable recoil means better followup shots.
These advantages (in my opinion) outweigh any improvement in stopping power that other cartridges might offer. 10mm hole in the wall beside the attacker is not guaranteed to stop him. (and if a warning shot or merely revealing the gun does the trick the 9mm will work just as well.)
On the caliber wars, particularly concerning pistol and revolver calibers:
I will be the first one to admit that I am an armchair general on this issue as I have not used pistols in real combat (or been in real combat for that matter. I hope that remains the case in the future as well.) but I have read my share of studies and "studies" on "stopping power."
The fact is that all the studies have to rely on guesswork or make up parameters since it is impossible to study the effectiveness of weapons on humans in laboratory quality experiments. Perhaps if we had Josef Mengele to help things would be different, but as it is we have to use material that is less relevant to real battle.
Still, the impression that I have gotten (and I admit that I may be wrong) is that hit location is the most important factor and honestly the differences in energy between 9mmPara, .40 S&W, .45ACP and the other most common calibers is quite small. With modern hollowpoints most values that can be measured are not that far from each other (with recoil and magazine capacity having some differences but modern pistols do have fairly large magazines for each caliber available.)
In the end, I seem to have the impression that the hit location is the number one deciding factor on the effect on live target and penetration comes in second. Everything else falls far behind (at least with pistols and revolvers.)
There are stories from shootouts where certain "gun" failed to stop a hostile person while another had a "one shot stop" but even then the location and ammo seem to be the factor in these.
If I had to choose one pistol to defend myself with I would pick one in 9mm caliber but that has more to do with the cheap ammo and large capacity magazines available than the actual "stopping power" in the gun. With cheap ammo I could afford to train more and with more training I would be better with the gun. I still wouldn't trust myself to shoot perfectly in a high stress situation so bigger magazine is a bonus and a manageable recoil means better followup shots.
These advantages (in my opinion) outweigh any improvement in stopping power that other cartridges might offer. 10mm hole in the wall beside the attacker is not guaranteed to stop him. (and if a warning shot or merely revealing the gun does the trick the 9mm will work just as well.)
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