Did I not mention this xbow with a thread that started before this one????(I think so ,you might want to look)Dan&Don that was 155ftlbs of energy, which you figured out masterfully,it was a 425g bolt, see what everybody said about you was not true, you do have more than a grain of brain..LOL And by the way I could get at least 450fps or better out of that puppy...LOL