i have used wool batting many many times...my favorite batt...i've only used Dream Wool...
the package instructions state about a 2-3% shrinkage...same as WARM & NATURAL...
when i finish a binding on a quilt my next step is to toss it into the wash and then the dryer...i wash my quilts with warm water, detergent...and put into a warm dryer...i've never had one not come out great!