I live in the UK and bought an old cream WWII wool blanket and used that for wadding. It was easy to quilt through (I have to machine quilt now) and I thought a good weight for a quilt as I often feel 'modern' battings are a thin feel. My daughter is pleased with her quilt.
Hand wash or use either the handwash or the wool setting on your washing machine, seemed to work ok. I would certainly do it again. The only limitation is the size of these blankets as the singles seem to have survived better than the doubles which are rare.
By the way these blankets are sort of loosely woven compared to the modern fluffy felted look.