You could crank it all the way you can on both limbs, then back off being consistant with each limb, just write down how much more cranks you put on them to put you back... Not all bows will max out what the draw weight is. Example just because a bow manufactor says the bow is 55-70 you may not get 70 out of it. It could be maxed at 68 or 72 like mine is. After you've done that take it to a bow shop and have it checked on a scale to see what our actual draw is.