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the ammunition is equal to the effectiveness of that of a .45 or .40 caliber pistol
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Effectiveness is a good word for it. A lot of factors go into that; if you can't hit the person then it doesn't matter if a 45 ACP round does more damage to the body or not. If you can't hit them in a vital area they probably won't go down quickly either so the most effective round is simply the largest round your average Joe can make successful initial and follow up shots with out of a semi automatic handgun.
IMO the most overall "effective" handgun round is probably the 9MM because it is the easiest to shoot for the largest number of people.
Me I like to keep my option open, I can shoot the 9MM or 45 ACP with the same effect on target. I will admit my follow up shots are a little slower with 40S&W.