Prevailing wound ballistic theory does not agree with this. Higher velocity or heavier bullet magnums are not considered to do meaningfully more damage than other bullets that expand and penetrate sufficiently. They either penetrate further and exit the body without further effect, or they cause slightly greater temporary stretch of surrounding tissue without further damage because of the elasticity of that tissue.
If this theory of wound ballistics is true, it has profound meaningfulness especially to those loading and carrying 357 and other "magnum" cartridges. If this is correct, Magnum users have an acute opportunity to do something that is possibly very counterproductive and at best completely useless.
It is important to understand that this theory does not negate all the value of 357 Magnum or make 38 Special "just as good." What it does suggest is that 357 Magnum, 125 grains loaded to 1100 fps is enough and that loading it to 1600 fps or 158 grains to 1400 fps is not any better. But, sorry, 125 grain 38 Special loaded to 890 fps still sucks.
Not true. The old technology 125 grain 357 mag @ 1400 fps is more effective than any common 9mm load. However, few people today can handle one effectively, and they have been largely cast aside for the altar of hicap pistols.
For the same reason the 357 Sig is effective, but, neither are popular with the jello crowd.
In real people, magnum revolver wounds can resemble rifle type wounds. Organs turn to jelly and trauma is indicative of high velocity rounds. Granted, not every one is identical but they are still very effective.
Having been a student of the gun for some decades and having been carrying a gun professionally since people still used solid lead bullets on duty. I can say that for all the "improvement" with pistol bullets, many people still take an awful lot of 9mm bullets to stop them.