An old US Army training video, with a few "updates" - got the link from my nephew (did a search and didn't find anything previously posted, so have at it ;^):
In the 1980's Pistolero Magazine shot live barnyard pigs in Mexico to get around U.S. animal cruelty laws and found zero difference in killing power between the .38 special, .357 mag, 9x19 and .45 acp. Pistolero said the pigs jumped higher and squealed louder when hit with the 9mm as opposed to the .45 acp.
Pistolero's tests proved that there is a vast difference in killing power between a pistol round and a high power rifle round.
In the book "The Ingles Diamond" it states that in 1945 a whopping 34 years after the .45 acp was adopted the U.S. Army found that the 45 acp was literally a "dud" round when it came to combat use. The .45 acp bounced off a military helmet at a scant 35 yards while the mighty 9x19 penetrated a military helmet at an astonishing 125 yards and might have done so even further away but no one succeeded in hitting the helmet beyond 125 yards.
So why did not more nations adopt the .45acp??????? Only a few did while the majority of the world adopted the 9x19 since it was invented decades ago.
It was because the 9x19 shot flatter making hits at long range easier.
The 9x19 had less recoil making it easier to train people to be accurate shooters.
The 9x19 carried more firepower.
The 9x19 had greater penetration than the .45 acp.
The 9x19 round was less costly to make.
The 9mm round was smaller and lighter and the soldier could carry more rounds of ammunition on his person.
I personally shot a 180 lb deer with a Glock 19 using 125 grain Remington old fashioned "golden bullets" that were "not" bonded. The deer died after being shot just once and died quickly. So much for the 9x19 being an anemic round.
Down through the decades there have been so many laughable myths about the .45 acp it would fill volumes. One of my favorite Moronic Babblings was that the .45 acp can knock a man off his feet, or spin him around like a top or make him disappear in a red puff of mist. The sad thing is people actually believe such malarkey.