"There's one very good reason that 9mm generally has a higher capacity than a .40: it takes a hell of a lot more bullets from a 9mm to stop someone."
Yeah, no way it could have anything to do with the fact that the rounds have a smaller diameter and you can thus fit more of them into the same size frame. That'd be silly.
"Since you want it for protection I'm going to assume you'd like 1 shot takedown. Unless you're extremely good with head shots, I'd suggest the .40 for your desired use."
Why would you assume a single shot takedown? Ever looked at how often that happens? Even the police, who are pretty much gonna have more training than you or me (not ability, mind you, but certainly more training) are generally trained to do double-taps. Why? Because one-shot stops are unreliable regardless of caliber.
You are also making the fatal assumption that the primary role of a firearm in a defense scenario is to actually shoot. More often than not, the mere presentation of the gun will stop criminal intent in its' tracks. A 9mm is as good as a .44mag insofar as presence of firearm is concerned. You still have some screwy ideas of ballistics and terminal effectiveness though if you think that 9mm is an utter failure and .40 S&W is the magic pill.
"Yes, the ammo is a bit more expensive, but you'll only need 1 shot pretty much wherever you hit them."
Yup, because Winchester packs fairy magic into every .40 S&W round they sell. Even if you shoot some perps' left hand, he will die on his feet from transmitted shock.
Yeah, I'm being real snarky here. I'm not actively trying to flame but I am pretty tired of people that obviously know jack about ballistics and terminal effectiveness coming in and touting one round over another when said round is minimally different from the other. If you want a true one-shot stopper, better toss that .40 S&W and start carrying a 7.62 NATO, probably the most proven one-shot stopper in history.
Oh, if you're wondering what handgun round actually has a good one-shot record, .357 magnum, hands down. .40S&W is a moderately good round, nothing more, and trying to elevate it to magic pill status is just passing on junk marketing or, worse, patent untruths.
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