Taylor is best remembered for his KO theory, but if you're going to read his stuff its better to look at all of it. Right off the bat, the KO theory was about trying to predict the ability to knock down non-fatally head shot elephants with solids and nothing else. Unless you are willing to take a list of every animal in the world and cross off everything that ain't a badly head shot elephant, I wouldn't read too much into it. If stopping elephant is in your plans here's the summary. "Use the big one".
There's more, Taylor specifically mentioned two calibers as working better than his formula would indicate. They were the .375 and .416, and they are both faster than the rest of them. Imagine that. He was also quick to point out that once you enter the world of soft nose expanding bullets that footpounds of energy was about as good a measure of killing power as any.
Gotta run, and chronograph some new .458 loads.