The legend of the 45 ACP is based (in my opinon) on the 1904 Thompson-LaGarde Report presented to General William Crozier.
The Analysis was based upon test firings of 9mm Luger, Colt 38 Model 1903 Army revolver, Colt 38 Military Model 1902 Semi-Automatic pistols, Colt 45 New Service Revolvers, Colt 455 new Servive Revolver, and Colt 476 New Service revolver. The tests occurred prior to and did not use 45 ACP.
Caliber specific's included:
9mm 92.6 gr 1420 fps 415 ft/lb
9mm 123.5 1048 301
38 Rev 148 763 191
38 Auto 130 1107 354
38 Auto 120 1048 293
45 Rev 250 gr 720 288
45 Rev 220 700 239
455 Rev 218.5 801 288
476 Rev 288.1 729 340
For comparison the winchester website lists the following information:
9mm 115 gr Super X Silver tip 1225 fps 383 ft/lbs
38 Special158 g LSWC SuperX 755 fps 200 gt/lbs
357 mag 158 JHP SuperX 1235 fps 535 ft/lbs
45ACP 185 SuperX J-Silver tip HP 1000 fps 411 ft/lbs
45 ACP 230 gr Supreme 880 fts 396 ft/lbs
Therfore the legend of 45 ACP stopping power is based heavily upon the 45 Colt revolver cartridge. The test involved shooting into human cadavers and living animals.
The conclusions were that "...the effectiveness of weapons of the pistol or revolver class increase with cailber rather than with the velocity. .... The stoping power and shock effects increased, as already stated, with the sectional areas of the bullets used."
It is important to understand what the report meant by "shock effect." The following is for the 9mm in cadavers...."The shock effects were not perceptible when soft parts alone were hit and scarely perceptile when joint ends of bones were traversed. When the middle of the shaft of the long bones was struck, the shock effect was equal to that of the 45 caliber Colt's Revolver with blunt-pointed bullet, and is consequently rated at 80."
They determined that a standard 9mm and 38 Special are no match to a 45 Long Colt or 455 Webly when it comes to stopping power. I can understand that.
My conclusion is that I am very comfortable with my 357 Mag, expecially if I use heavy bullets at +P high velocity. I think the test also confirms the idea of very heavy bullets being better performing than lighter bullets as much as it says that bigger caliber is better.