You know,I don't buy into the "one shot stop" stuff.
Physically,and as has been explained to me,the only way to actually achieve such a feat as absolute immediate incapacitation is to hit the brain stem or the lower brain- the medulla oblongata
Otherwise,its up to hypovolemic shock
,or loss of blood.
These are the two ways to force a determined adversary down with handgun bullets.Of course,theres also psychological shock,the will to fight,etc; but haven't we all heard stories of people walking into emergency rooms with bullets/knives/big ass rods of steel like javelins and ****;etc,etc going right thru their skulls,right thru their upper brains..........steel rods like rebar in their chests......just barley missing big arteries like the pulmonary and aorta....
and there they are walking and talking........
A determined adversary could take alot of punishment from high explosives and still keep coming......so to think a single projectile from any specific handgun has a mathematically calculable chance of incapacitation in any given specific scenario just doesn't make any sense to me.
I'm not willing to rely on any percentage ratio derived by statistical analysis of highly anomalous scenarios like shootings to determine that such and such caliber is "better" then the other.
I'd rather rely on having a gun I can use to put hits where they count and keep hitting till I'm sure I'm safe from danger.
That,coupled with ammunition that will consistently
penetrate to punch holes in vital stuff,is what I'd rather stake my ass on.
When someone is considering a weapon for concealed carry to stake their lives on,its more important that they can deliver and their ammo will not fail them,then any caliber consideration.