Are you absolutely positive you want to shoot the ACC. You might want to try a Internal Component System type pure carbon like a Carbon Express, PSE Extreme, Gold Tip XT Hunter, and etc... These type shafts weigh in at 8 grains per inch for the same given spine stiffness of the 3-39. They will save you alot of money too. Thier straightness factors are the same as the ACC (.003). A fully set up shaft with a 75 grain field point and 4" AAE fletching will put you at 340-345 grains. You could even crank your draw weight down and shoot 68 pounds. The CyberTec will easily break the 300 fps plateau with that set-up.