Please explain how a cartridge with less powder ends up generating more kinetic energy. Alternatively, explain how it's worse to have less kinetic energy.

You can reference this visual comparison of rifle cartridges to see what I mean: https://1source.basspro.com/news-tips/hunting-information/74...

Assault rifles were designed to allow soldiers to carry more bullets. It started with the Germans in WWII, who found that with mechanized warfare, infantry engagements were at closer range so they didn't need big heavy cartridges anymore.

Note that the .30-06 is a hunting cartridge today but it was also used in the main American battle rifle in WWII, the Springfield 1903. There's also the .308 which is commonly used in hunting and also various military battle rifles and sniper rifles. No infantry soldier would claim either is less effective than the 5.56.

But it only makes sense at really close range with excellent shot placement - anything less that is inhumane and causes the deer to suffer.

You can also verify this by checking the rifles that snipers use if they have a choice - it's never an assault rifle.

Nothing about my message should suggest anything about the humanity of using assault rifles to hunt deer. It's entirely about being factual about the nature of assault weapons, which some gun nuts seem to intentionally deny.