the duallys are pretty stiff to draw. Back in the day I used to shoot 80# PSE carroll intruder.. then more recently a 70# zmax. Now I have a '03 Patriot Dually pulling 70#... I have it backed down to 60# and currently looking for some 60# limbs. From what I hear if you shoot a 60# bow w/ 300 gr arrow next to a 70# w/ 350gr arrows... they will be equally fast w/ the slight advantage going to the 70# model by a few FPS.