Bullet Energy some people don't get it

Nothing inaccurate with your post. But energy is a poor predictor of how effective a bullet is.

There is a "combo" of factors that make a bullet perform ...

Design ... must be designed to meet the desired level of damage upon impact and penetrating... most hunting bullets for small and medium game are in fact Hollow Point ....they may have an open HP or the HP can be filled with a piece of "plastic"... but they are HP none the less... Full Metal Jacket are for fur hunters and solids for really big game...

Velocity... goes back to design ...must have a range of velocity that meets the design... Cartridge choice ....powder, primer that works to provide velocity..

Energy is the math that weight and velocity gives ...

Total ....All of the above combined factors make the ideal bullet ... match the cartridge.... match the design for the game hunted ... it must ALL work together...

Yeah? So?

I'm trying to understand what you're referencing. Kinetic energy is only one piece of a complex puzzle. Velocity, mass, bullet diameter, and bullet construction are all important.
9mm isn't comparable to 223.

A 45 Colt has less energy than a 223.
It will go end for end in a cow.
A 223 will not.

I see your Energy, and raise you Momentum, Permanent Wound Cavity and exit holes.

As well, the equation you allude to was in regards to soft point and hollow point self defense bullets by civilians, not FMJ, which everyone knows will pencil a hole through mild steel with no problem.
I have personally shot a Hornady 50grn SPSX into a DirtyBird target on a cardboard box and not had a pass through.

I call. Let’s see ‘em.

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Demi-human said:

I see your Energy, and raise you Momentum, Permanent Wound Cavity and exit holes.

Click to expand...

Pheeezicks!

U b keeedeeeng meee!