It's not a belief of the past... It's proven data dude. But you think you're smarter than every ballistician making ammo, along 99.9% of ethical hunters.
Me and 998 others guys out of 1000 disagree with you.
I’m going to try to explain a few things, but I’m not going get in an argument. A lot of people have way more experience than me, but I know the basics.
Hunting bullets can be out in 3 types of bullets each with distinctly different performances.
All copper bullets - start upsetting or “mushrooming” and continue doing that through the animal with the widest bullet being at the end of the animal. The bullet stays together and really only wounds what is really close to the line the bullet travels. Everything being equal, they kill slow because they do not damage much tissue.
Bonded bullets - upset more and wound more tissue than all copper bullets. They lose some of their material as the bullet upsets, thus damaging more tissue out of the bullet path.
Cup and core bullets - damage much more tissue because they break apart significantly and damage tissue much further from the path of the bullet.
A 6mm bullet that is an all copper bullet might make wound through the animal the side of a quarter in diameter whereas a 6mm bullet that is a cup and core bullet (eldm eldx) could make a wound the diameter of a softball.
When people say energy is irrelevant, they are correct. Bullet manufacturers publish minimum impact velocities that correspond with what they consider adequate upset or “ “mushrooming”. It’s not consistent across manufacturers so a Barnes TTSX at its minimum impact velocity of 2000 fps or whatever they say may barely peal pack the tip and create a nickel size hole, whereas an ELDX at 2000fps may make a softball size wound.
Also, the energy is irrelevant because the only thing that matters is what velocity the bullet hits the animal. A 7mm 175gr ELDX will not have a wound that is 1.7x the size of a 6mm 103gr ELDX if impact velocity was the same, yet it will have 1.7x the energy since KE= 1/2MV^2 Mass is directly proportional to the increase in KE, yet the wound is nowhere near 1.7x the size.
That’s all I got
Edit - there are thousands of photos of kills showing all of this. Please take the time to read it. This isn’t an insult or me fighting, it’s a suggestion to understand the other side of your argument better. If you still disagree that is totally up to you.