OK, so I am looking at both right now, a 125g hollow point in 9mm & .357 magnum. The 9mm travels at ~1100fps & the .357 at ~1400fps. True or not, I hear a lot of talk of the 9mm creating a devastating wound, but not a high number of one-shot stops. (we all know about shot placement and all; lets assume a center of mass hit for this.) In other words, the treat is generally not neutralized as quickly. A .357mag has a reputation for one-shot stops with very devastating wounds. The treat is, in general, neutralized quickly. These are the reputations that I have heard. The question is why? Is the 300fps average increase in velocity making that much of a difference? Or am I missing out on something more important? If velocity is so important, why does the .45acp have a reputation for one-shot stops... aside from just being almost twice as large, 230g at ~850-900fps. ? I have no ego attached to either round, I'm looking for "just the fact, ma'am". Thanks in advance!