Auctually the advertised speed on the Exocet is 330 fps I am shooting GT laser II from Dan Miller in mine and with the FFF string am shooting in the same area your are 320`s I think that if you are getting within 10 to 15 fps of the advertised speeds you are doing good I have herd of some of the Excals auctually shooting faster than the advertised speeds. not sure what mine would shoot if I were to shoot the standard Excal arrows the ones that weigh 350 grains but bet I would be right at the advertised speed ratings. Excals are definately fast and powerful.. and easy to maintain