R/H I do not want to derail the post and I do not want to turn this in a caliber argument. The effectiveness of a handgun caliber rests on 3 legs according to the experts. 1. Penetration 2. Permanent wound canal and 3. the ability to shoot the largest that you can shoot accurately. Multiple hits is an important factor when you need to stop some one that means you harm www.buckeyefirearms.org/alternate-look-handgun-stopping-power www.chuckhawks.com/handgun_power_chart.htm http://dailycaller.com/2013/07/16/defensive-carry-caliber-and-incapacitation/2/ https://www.americanrifleman.org/articles/2012/8/29/handgun-stopping-power-sizing-up-your-options/ http://monsterhunternation.com/2008...gun-statistics-and-why-theyre-a-load-of-crap/ https://www.scribd.com/doc/252518687/Handgun-Wounding-Factors-and-Effectiveness Some articles that gave me clarity. Yes, knockdown power and one shot stopping power in a handgun is a myth. A lot of research is done by Law Enforcement Agencies. They wont use something that won't work. FBI has reverted back to 9mm P.