Maybe off-topic, but I'll share a story about 223 on game.
I went to my ex-wife's property to help her next husband put down a steer and butcher it. I have no experience with this, but I was invited with my adult son for support. I guess the method is to lay down oats and when the steer puts his head down to eat, shoot him right through the skull. He used a 357. He wound up shooting from too far away and missed, the bullet went through the snout and missed the brain. This poor steer bled horribly and ran off. I happened to have an AR in my truck, got it out to finish the job. I did not want to take a heart lung/shot with an animal that big from a 223, running injured for days longer. I made three successful head shots from straight on from about 40 yards, with no hearing protection. I could hear each round "click" and bounce right off the skull. At that point I told the guy - GET TO YOUR HOUSE AND GET YOUR 308!. That did finish the job but it was such a sad and horrible experience. I was given some of the meat after processing and every bite was a reminder. It's something I can't forget