RE: measuring a bow
To get the AMO bow length, you will need a cloth (or otherwise flexible) tape measure. Start at the top of the string groove, measure along the side of the limb following the contour of the limb, through the center of the riser, down the other limb to the top of the other string groove. If the bow was made to AMO specs, it will need a string 3" shorter than that measurement.
Chad