MachIVshooter
Member
Sectional density, momentum, bullet construction. Kinetic energy means nothing in terminal ballistics. It's marketing. Nothing to do with penetration
You have much to learn, young grasshopper
The kinetic energy a round develops directly translates to it's ability to do work. That work is penetration and expansion. More kinetic energy=drive the same bullet deeper, expand it wider, or both.
No, it's certainly not the only factor. But it is an important number to consider. You understand that momentum is important; What do you think momentum is? A product of Mass and velocity. Guess what KE is? That's right: A product of Mass and velocity.