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Originally Posted by Axelwik
Actually if you do the math, the AREA of a 9mm hole is only 62% that of a 45 caliber hole. So two 9mm holes would only be 124% that of one 45 caliber hole. Not much difference.
A 9mm would be only slightly better (by only 24%) only if you could get two hits into a vital area. A 45 would only require one hit for almost the same area.
It would take 13 rounds of 9mm to equal 8 rounds of 45 (a standard 1911 magazine holds 7+1 in the chamber).
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I'm sorry, but this is complete nonsense; the area of a bullet's cross section is NOT directly proportional to its effectiveness. And no, ridiculous formulas like "power factor" don't mean much in real life.
Misinformation like this is what gives online gun forums a bad name. New shooters come on forums, see nonsense like this and believe it - at least for a little while. Then when they're finally corrected they end up losing trust in ALL gun information they see online. Which is a shame, because there is normally lots of good information here.