Re: Taylor Knock Out (TKO) Scale
The TKO method reminds me of the old Hatcher Relative Stopping Power formula :
RSP = M * V * A* F
M = bullet weight in pounds (ie, grain weight / 7000)
V = velocity in ft/sec
A = frontal area in square inches
F = factor which varies with bullet shape. This factor ranged from 0.9 for jacketed round nose slugs, up to 1.25 for lead wadcutters.
Hatcher's formula doesn't account for expanding bullets either.... it was the result from some U.S. Army tests conducted in 1904. Expanding handgun bullets were unheard of back then.