Hi all.

Very interesting thread.
My own theory? experience + education + luck = success.
Fact is we are all far better educated regarding ballistics then most were back in Taylor's day.
We also have entirely different components to consider.
No matter what forumla we come up with there will always be variants which will take it one way toward success or the other toward failure.
Bullet jacket thickness is but one factor.
Even with regard to 'solids'. Are we talking about 'hard' solids or 'soft' solids?
The metallurgical composition of a solid could render one successful & another a complete failure.
Then we even have factors such as the animal itself.
Heavy boned, lighter boned, etc.
There's really no absolutes in it all.
In the end 'formulas' are only a guide.
They are all prone to failure unless all factors combine to produce the right results.

And after all's said & done - elephants, lion, & cape buff' cant read.