Very big vitals... Problem is the difference in high/low shots vs right in the boiler. You don't want to hit one bad, I've tracked a few that people shot and it turned out bad for all of them. The elk wounds close easily too. First bull I shot bled like a dig dog for 100yds or so and then went to a tiny drop every 20-40yds down a gravel road. Even double lunged, he made it about 600yds. Only other animal I've hunted that seemed as tough as elk was Mt Goats. 2nd bull I killed went about 60yds, very little blood as well. #3 was quartering away and bled well the whole time.