ORIGINAL: davepjr71
Then you get into form and such which can/will change the DL by an inch. Hand placement, elbow bend, shoulder out or tucked, head forward, backward or where it belongs all affect DL. You get the idea.
Then you get into the female shooter.... who may well require a bow a full inch or even more shorter than her measure because of the build of the female arm. If she is well endowed (I'm trying to be PC here...) then the measurement (no pun intended) is thrown off even more. A lot of women (but for some reason not all) it seems almost have a double jointed elbow that sticks out convex toward the path of the string when they extend their bow arms.... I'm sure its just a different build of bone or joint that the Lord saw fit... but thats how it is... and as dave put it... form has a lot to do with it.