Ok formulas. Here's one.

CLIENT HUNTER + AFRICA + HI AMBIENT TEMPS + DANGEROUS GAME + LABORATORY HOTROD LOADED 45-70, = PH's NIGHTMARE.

Getting back to Taylor's formula, wasn't it based on the effect of missed brain shots on elephant?
If so that would severely limit it's usefullness in relation to other game, including buffalo IMO.
A shot below jumbo's brain, would still have the bullet impacting heavy bone, where a shot impacting a (charging) buffalo skull below the brain, might only encounter the much lighter bones where the nose joins the skull.
There would be a lot of difference between the two I would think.

I have read Taylor over and over since the late 1970's, and I still enjoy reading it today.
I don't worry about his formula much though, because I don't shoot elephant.
Whether it is right or wrong doesn't really come into it for me, because it deals with a type of hunting and shooting which I doubt I'll ever experience.
To really know if his formula works, IMO you would need to miss the brain shot, on a hell of a lot of elephants, with a hell of a lot of different big game cartridges.