I have a set of these on a 415 fps cross bow and am shooting at 50 yards using a 6-24 X 50 scope. I am grouping with in 2 inches every shot and am waiting on it to cool down for deer season. I would not hesitate to use my Killer Instinct crossbow to hunt bear. At 50 yards i put a bolt 6 inches through a 2 X 6. That's stopping power.