I LOVE quilters Dream Wool! the shrinkage is minimal- it is wonderful to work with- I prefer it over the Hobbs wool- although theirs is ok
if your fabrics have not been prewashed that is where what ever shrinkage is going to occur will come from.
my whole cloth quilt with the dream wool batting is my favorite quilt- it fluffs up & is oh so- cozy & soft when it comes out of the dryer- and yet still fairly lightweight....I love all of the batts from the dream company- but the wool is by far my favorite.