Their Mom shoots at 30#. Both of their parents are smaller people. We are trying to get my sister in law up to 40# so she can hunt with a bow in Utah. I think a lot of pulling a heavier bow is just form. I used to shoot at around 70 to 80, but that is with a more modern compound. We had an indoor archery range that had a system called Techno Hunt, it would score your shots based on placement, as well as Chrono your arrows speed. We had a friend who had a Longbow that shot every bit as fast as our compounds did, and occasionally his arrows would go through the screen.
I guess my question should have been limb width and thickness. I have a Siberian elm stave that I think would work well.