I just recently returned from a bear hunt in Maine, met another hunter there, that took a bear earlier in the week with a 450 Bushmaster using Winchester Deer Season XP ammo, he was able to recover the bullet on the far side of the bear, it expanded well. He said the bear made it 10 yards before it dropped. However he never mentioned the range, I'm guessing just by the area we hunted, it would've been anywhere from 10 to maybe 60 yards at most.