It depends on your design, riser length and the profile of the limb. My 50s style 58" recurve form would take somewhere around a .205" total stack with 17" riser and 1.5" wide at the fades if I was aiming for 47 - 50#. That is using .040 glass back and belly. If I use different glass it would be a different total stack, same goes for different length riser. Miss it by just a little and it could end up 10# heavy or light.