The Alphabet org assessment of handgun caliber tissue dammage on people is probably accurate. But. Consider the size of the target.
Target size is WidthxHeightxDepth
325fpe, 120gr/9mm(.35cal) on a 175lb human with a 16"x16"x10" target(human torso)
75fpe, 45gr/.30cal on a 2lb squirrel with a 2.5"x3"x2.5" target(squirrel torso)
75fpe, 45gr/.22cal on a 2lb squirrel with a 2.5"x3"x2.5" target(squirrel torso)
You probably need to measure "killing power" not just on penetration, but on total percentage of tissue damaged in the kill zone by the path of a bullet. And also factor in the weight of the target absorbing the bullet energy.
Circumference
of .22=.691152
of .30=.94248
Area
of .22=.038
of .30=.070
Energy is transferred on impact. Noise is energy being dissipated. With airguns, this is audible. While the .22 and .30 pellet/slug both have the same energy, you can hear the difference between the .22 and .30 impact. Due to the frontal surface area difference. The .30 has almost twice the frontal surface area.
With a human torso, a temporary bullet cavity as a percentage of the target area is minimal compared to that of a squirrel. On a squirrel, the heart/lung cavity is a small flexible water bottle..the only natural exit is the trachea. It is contained by the ribcage and the diaphram. Most of a body is liquid. Liquid does not compress. That's why pop cans and gallon water jugs explode when hit. The size of the temporary wound channel passing through the heart/lung cavity of a squirrel displaces the size of the entire cavity. The only reason a squirrel does not explode like a water bottle is the elastic nature of the ribcage and diaphram.
It makes perfect sense to use the Alphabet org report when talking about tissue damage in heart/lung shots on deer and pigs, but on smaller sized game the "temporary" wound channel is probably a much larger factor.
