Does anybody out there know the rules for the HC class reguarding arrow weight and let off. I have read the rules posted on the IBO sight and there is no mention to those two subjects.Does the five grain rule also apply to this class? And is 80% letoff legal in this class for IBO shoots? I would hate to drive a long distance to a shoot only to find out that I have the wrong equipment. It is more fun being a participant than a spectator.