I was pleased to find The Best Defence on the telly; all kinds of useful bits there are! I'm fascinated with the chap demonstrating the concealed carry pistol; I've seen him demonstrate a S&W Model 10 and the Browning Hi Power (both of which I'm fortunate to have).
I would very much like to see this chart abalyzing the various ammunition for knock down potential. I noticed last night that the 9mm Luger scored ahead of 45 ACP for knockdown, which I found a mite surprising. 
My 1911a1 (guess I'm a classicist) has always been my "go-to" weapon for knockdown based on anecdotal evidence that 45 ACP was the gold standard. An old argument I realize, highly subjective and largely arbitrary, but if there is a link to that chart, I'm a bloke who enjoys examining data & poring over facts & figures to make educated, informed decisions.
What say you?
First off, I say welcome to the forum. Jolly good to have you aboard.
Second, I basically agree with your sentiment on the 45 ACP and also scratched my head a little on the chart information. A lot of that information on "knockdown power" is probably based on data compiled over the years by people like Ed Sanow and Evan Marshall (some links are posted below to further reading).
Martin Fackler also studied ballistics and wound data to support theories on what was/is the best defensive load for one-shot stops. He was key in the development and use of ballistic gelatin.
One thing to remember is that data such as stopping power data is a numbers 'game' that should be taken with a 'grain of salt' and is not all conclusive. Much of the information and data was compiled when different calibers were more commonly carried and USED for defense than what is popular today.
For example, not that long ago (on the grand scale of things) the .357 magnum was at the top of the list for one-shot stops. This was after a long period of time when many police agencies still carried it as a duty load. It takes a long time to overthrow long term data. Only about twenty-five to thirty years ago did law enforcement departments overwhelmingly switch over to semi-autos using 9mm, and later on .40 and .45 ACP (or GAP). Up until then, most cops used the .38 or .357 so the majority of the data would come from that arena.
Simply put, one of the reasons that the 9mm could be at the top of the list is simply that there are more of them out there, and therefore more of them are used in the shootings from where the data was gathered.
http://www.greent.com/40Page/general/oss.htmhttp://www.sightm1911.com/Care/45acp.htmhttp://www.firearmstactical.com/marshall-sanow-discrepancies.htmhttp://en.wikipedia.org/wiki/Martin_Fackler
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