Re: Taylor Knock Out (TKO) Scale
If you like the "mathematical" approach for predicting handgun bullet effectiveness, you might enjoy the book Street Stoppers, written by Marshall & Sanow. They compiled "one shot stop" probabilities for more than a hundred different loads, based upon thousands of actual police shooting reports. The book also contains data from bullet tests in 10% ordnance gelatin, and promotes a mathematical formula developed by a guy named Fuller.
If you're a REAL glutton for punishment, I might suggest the book Bullet Penetration, written by Duncan MacPherson. This book advances the views of the International Wound Ballistics Association.... very scholarly, but the math gets over my head in places.
The IWBA thinks that the best predictor for bullet effectiveness is the permanent crush cavity created in 10% ordnance gelatin, providing that the bullet penetrates at least 12 inches..... and for mathematical purposes, any penetration over 15 inches is regarded to be "15 inches"..... they figure that the average bad guy is only 15 inches thick, so any penetration beyond that depth is irrelevant.
The good news is, the gelatin tests in the Marshall-Sanow book include the data for permanent crush cavity (and penetration), so you can use those numbers for the IWBA approach if you want to.