Come on...I am almost positive that when the FBI or the US Army select calibers for ballistics testing, they use 2x4s and pumpkins. Those media are a perfect analogue to terminal effects on human bodies. Which is important, because obviously massive law enforcement and military organizations don't have any actual data gleaned from thousands of shootings in both domestic shootings and military firefights to look at or anything. And even if they did, there's no way one of their foremost experts would every post about it on the internet.
http://publications.gc.ca/collections/collection_2008/ps-sp/PS63-2-1995-1E.pdf
http://publications.gc.ca/collections/collection_2008/ps-sp/PS63-2-1998-3E.pdf
Note that they use pig ribs in gelatin. And note the article about security contractors in Iraq that I posted above, where plain old 9mm ball dropped people with thoracic triangle hits. I've read somewhere that the majority of fatal shootings involved .22LRs. Most police departments and militaries are just too cheap to 'waste' enough practice ammo on maintaining the shooting proficiencies of their personnel, and that's why the debate over 'stopping power.'
The video below shows a Sig P226 being loaded full of dirt, fired, held under water till the bubbles stopped, fired, buried in the mud at the bottom of the water, fired, then held under water and fired.
Sigs and H&Ks are the gold standard. But even a .357Sig won't stop a cougar. 10mm (e.g., G20sf, with a 6" barrel and 200gr. hardcast) on smaller predators, but not black bears and no way adequate for browns. And even restrikeable pistols leave you ineffectually bumping the same dud primer, when a revolver just rotates a new cartridge into play. Pistols of any calibre work against humans (unless they are crazed tweakers), because no rational human wants to suffer a gunshot wound. However, animals don't know what a gun is, and don't care. And, with their heads at about the same level as their hearts, tetrapeds can sustain major collapse of bloodpressure, before they keel over. There is also, cross-sectionally, more tissue and bone to plough through, before hitting the heart, or CNS. For example, the scull on a brown bear can be up to 7" thick in parts. This is why high sectional density rounds work well on, say, white tails, while lighter HPs are good on humans, even though their weights are similar.
Not to mention where exactly is the lint going to enter a auto loader that is can not enter on a revolver? As well if you are CCWing you better have it in a holster.
Lint finds its way into
everything (e.g., the extractor and slightly greasy barrel, peaking out of the ejection port), and moisture from perspiration kills primers. And have you ever been in the back country, slipped and ended up in silty muck? I've done this, and I dread to think what that would do to a Glock 20 that I was depending on protecting me from a cougar. And yes, one should use a holster...but a good one:
http://www.itstactical.com/warcom/f...her-holsters-can-cause-accidental-discharges/
Obviously, CCW is a non-issue for me as a lowly civilian Canuck, but I'd be inclined to use a Kydex holster, and preferably something with an external hammer that I can hold my thumb on whilst holstering. I've tried this with a cheap, stiff leather Yaqui holster, and it seems safe.
Effectiveness of the round, ease of follow up shots due to lower recoil, easier to conceal more rounds in a smaller package....just to name a few.
Don't forget hoop stress and less chance of kabooms. Kabooms are exceedingly rare with nines. This is important to me, as I'd like to get into reloading my own ammo, and casting my own bullets (I have an enormous hoard of old lead and wheelweights...). And even the beefed-up .45 G.A.P. brass seems kaboom-prone:
http://www.theledger.com/article/20080313/NEWS/803130481