It all depends on the bow. If it is one that has a boxy tiller and sharper corners, a bit more than ten percent is possible. One can loose five pound by just rounding the corners, if one then sands the glass thinner a few more pounds are possible, if one then reduces the limb dimensions and increases the trap a few more pounds are lost. If it is one that came in heavy to begin with, some of these steps may already have been taken to get down to the order weight and not so much can be reduced. However, these bows tend to be lean and mean and really are fine shooting bows.