Fremont,
I haven't used Quick Design, but don't you get your cases water capacity by filling a fired case with water, then seating a bullet to your guns COAL, then remove the bullet and re-weigh the case with water in it? Then multiply this water weight by .85?
I've used this method to make sure my starting loads make sense when creating a new load. This number would be way off from 1.3gr, so maybe I am thinking of something else when you talk about "water capacity."
