I've only flown 3 different CoC head brands and of those 3 Mobowhunter is very correct.
Stingers= as good as broadhead accuracy gets IMHO. I guess they are just more forgiving than the other heads I've shot.

Obviously if shot out of a perfectly tuned bow & a hooter shooter they should all group inside of one another, but when the variables differ here or there the Stingers come out on top of the accuracy game in my backyard.