STRAIGHTNESS AND WEIGHT CONSISTENCY DETERMINE THE BEST CROSSBOW BOLTS To shoot any group of projectiles accurately and with high precision, your projectiles must be as identical to one another as possible, and you must launch the projectiles with the same force and motion each time. most crossbow bolt shafts on the market have straightness measurements that range from 0.006” to 0.001”. This means that if your bolts are said to have a shaft straightness of 0.006”, then the arrow shafts will be up