“...Energy of the bullet is weight times velocity squared(not weight squared)so velocity is the source for energy and stopping power(not killing power either...” [Colt1851Navy, post 43]
Wrong.
KE = (mv**2)/2
where
KE = kinetic energy
m = bullet mass
v = velocity
to obtain energy in foot-pounds, use this formula:
energy = (gr*v*v)/450380
where
gr = bullet weight in grains
v = velocity in ft/sec
450380 is a conversion factor to account for gravitational acceleration, and the 1/2 in the basic equation. Units are complex but it tracks properly.
Stopping power is not quantifiable. That’s why DoD doesn’t use it in measuring effectiveness. Same for “killing power.”
Here’s an esoteric one....
Bullet weight in grains times bullet diameter times muzzle velocity divided by 7000. This gives John “Pondoro” Taylor’s “Knock Out Value” as he called it.
I pretty much favor a saying by a friend of mine, “Shot placement is King, adequate penetration is Queen, and all else is angels dancing on the head of a pin.”