While you're correct that there's misinformation on the left, there's also misinformation on the right. The cartridges were designed for killing humans at distances most likely to be encountered. They were also designed to be able to fit more into the magazine, and allow you to carry more of it. The only real distinction between them and military assault rifles is selective fire, but even then that is for suppression. A soldier trying to hit clean targets is either going to fire single shot, or 3 shot burst. A person who is good at handling the weapon can easily fire all 30 rounds in 10 seconds with little loss of accuracy, because unlike a hunting rifle, it's designed to remain accurate with rapid fire. In short, trying to say it's closer to a hunting rifle than it is a military weapon is a larger degree of misinformation.