5.56mm vs 300AAC Blackout vx 7.62x39mm
Hat tip to Eric over at http://gunmartblog.com for the video. I would have really liked to have seen the back side of those targets. They did a good job of showing the entry wound and the splatter out the back, but did not even show the exit wound at all.
They also failed to mention the bullet weight of the 300 Blackout round.
Unfortunately I do not have a photo handy comparing all three rounds side by side (I can do that later on if interest is there).