Never built a bow with winged elm, but I have 4 American elm sapling bows in the making . 3 which I am shooting , but not finished. The three that are done maintain some reflex. 50, 54, and 67 inches long with lots of character , and in the 40 lb range. They perform much like hickory. I used heavy belly heat treat on them. I think it is a softer elm, but still OK for lower poundage bows.