Don't believe in 'stopping power ' ?
My early tests using tough woodchucks as a test showed an important difference between 9mm and 45acp. This was before the fancy JHPs.
A hit with a 9mm that wasn't an immediate kill --the chuck would RUN back to his hole .
Same hit witha 45acp -- the chuck would WALK back to his hole !
And Watson , bring your revolver !