I can shoot my killer instinct out to 70 yards easily, but I keep my shots on deer within 50 to make sure they don't duck the arrow.
Red what model is your Killer Instinct?
I have the Lethal 405 and cannot keep it zeroed with the upgraded Vortex Scope I put on it. It will zero and within half dozen shots it's off again. Something is loose somewhere but haven't taken the time to find what is. I just put it up and broke out my compound.