This is a good read: http://www.firearmstactical.com/pdf/fbi-hwfe.pdf
One good quote: "There is no valid, scientific analysis of shooting results in existence...there are some well publicized, so called analysis of shooting incidents being promoted, however they are greatly flawed. Conclusions are reached based on samples so small that they are meaningless. The author of one, for example, extols the virtues of his favorite cartridge because he has collected 10 cases of one shot stops with it."
One good quote: "There is no valid, scientific analysis of shooting results in existence...there are some well publicized, so called analysis of shooting incidents being promoted, however they are greatly flawed. Conclusions are reached based on samples so small that they are meaningless. The author of one, for example, extols the virtues of his favorite cartridge because he has collected 10 cases of one shot stops with it."