Excalibur emailed me today about detuning my crossbow. It turns out that ALL excalibur limbs are the same and it is the stroke that makes the power numbers change. So I can't turn down the power to use it at 3D shoots. I guess bigger is not always better. I am thinking really really heavy arrows to come in under the speed rules, maybe fill one with with lead if they want to test the speed of my crossbow. Would that be wrong??