I was able to observe that some projectile brands/manufacturers insert images or texts on their packaging "recommending" a certain cartridge, which, despite being of large caliber, has little energy, for large animals.

I can mention for example the classic 45-70, a low energy cartridge (especially after 100m) being recommended for Mooses, Bisons, Elks, etc... While a 7mm RemMag or a 30-06 has much more energy and its recommendation covers smaller animals in addition to medium and large ones.

I would like opinions or clarifications from you (who will read this topic) about why this happens.