If you divided your power factor by 7000 (bullet weight in pounds) then you have Pondoro Taylors TKO value.

While this measure of performance of large calibre cartridges on big dangerous game gets it's share of sceptics, they seem to ignore the fact that Taylor came up with this formula based on the use of heavy solid bullets just missing the brain of elephants but still providing enough stun effect to cause the collapse of the animal and a period of incapacitation allowing a killing shot to be applied. Obviously this sort of performance can also be applied to other large heavy dangerous animals.

Most of the big nitro express cartridges in use during Taylor's time operated with velocities in the 1900-2500 so he found comparisons of performance of these cartridges was better recognised by placing equal store on bullet diameter, weight and velocity.

Taylor, who was a veritable poacher, is credited with killing over 1500 elephant and hundreds of buffalo, rhino and hippo and found that his TKO value gave a good correlation to performance of individual cartridges on these animals.

Those sceptics that discredit his formula should be prepared to back their credentials and tell us how many elephant and other DG they have stood and faced alone without backup and of course with what cartridge/s they were using to match his performance.
W.D.M. Bell you keep quiet and stay out of this discussion.