What has two thumbs and is a nerd...THIS GUY! (One-Shot-Stop Calculation)
Most of the data may be considered common sense but for new guys like me, it might help make decisions.
After reading so many conflicting threads and opinions regarding one-shot-stop and "big and slow vs. small and fast," I decided to do some mathmatical analysis. I plugged the FBI one-shot-stop data table into a spreadsheet and performed a regression analysis to determine the key factors in ammunition and one-shot-stop %.
The end result was that energy is the largest factor(pretty duh, I know) and bullet diameter is pretty much just as important (less than 1% difference in importance). When the energy is the same, the wieght is more important (twice as important actually) than velocity. Long story short, when in doubt go bigger diameter and heavier.
The following is the equation to determine the estimated one-shot-stop % of a handgun round:
x1 = hollow point (0=no, 1=yes)
x2 = bullet diamter
x3 = bullet weight
x4 = bullet velocity
Example: 45ACP 200gr JHP @ 975fps
Now everyone grab a cup of coffee and wake up.