Evan Marshall has written three books on this subject. It gets complicated; it isn't just the caliber. You get different percentages depending on the style of ammo (ball, JHP, wadcutter, etc.), the brand, and even the make of gun. Google "Evan Marshall" and it'll give you a start.
Bottom line; you can't get 100% one-shot stops with any gun that doesn't have wheels on it... But you can come close.
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"Valor needs first strength, then a weapon."
-- J. R. R. Tolkien (1892-1973)
"Free men have arms; slaves do not."
-- William Blackstone (1723-1780)
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