What kills critters is shot placement, penetration, breaking internal body parts, and loss of blood. Assuming all other factors such as similar bullet diameter and construction are similar, energy numbers are a fairly accurate way to predict how effective the bullet will be.
But different bullets do that damage differently. Using energy numbers to compare a 44 mag round to a bottle necked smaller caliber bullet will lead to misunderstandings. Both can work effectively.
Seeing how a steel plate reacts to being hit isn't very helpful at all. That is measuring momentum and momentum doesn't really predict anything when related to killing critters. If I need to knock over steel plates then my choice in firearms may be different than when hunting big game.
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"If you're still doing things the same way you were doing them 10 years ago, you're doing it wrong"
Winston Churchill
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