Some will read this and call BS, but I was there and watched it with my own eyes, and I'm a pretty honest guy. So it's not BS.
Couple of years ago while deer hunting, my buddy had a big boar come in and he dropped it with his rifle. Walked up on it and it got up and started running. He drew his 10mm and put one in the shoulder, it dropped, and then he walked up and put another in the head. Went and got the Ranger and winched it into the bed, then it started trying to get up again while winching....2 more 10mm rounds made it stop again.
Once back at camp, getting ready to process it, it started flopping around and trying to get up again. Our jaws were on the ground- this was the strangest thing we'd ever seen. 2 more 10mm rounds to the head again and it stopped, again. Then we quickly took the knives out and got to work. We didn't want it getting up yet again.
So, as
@ButterBean said, these are some tough SOBs.