Also, there is a lot of variation between the species. I have no doubt that you could make a 120 lb. bow from white ash, it's tough as nails- 603 would be a very reasonable weight for it. I've made several close to 60# with no problems. Green, black, pumpkin, and some of the other ashes are weaker wood than the white. I've seen pics on here of several nice bows made from European ash.