I have been trying to throw some larger jugs. Results are most encouraging with 15 and a half, 16 and a half, and 17 and a half inch high jugs thrown so far.
The first two were with a mixture of earthenware, and heavily grogged earthenware clay, and the tallest (shown below with handle still to be attached) is made with my usual earthenware clay.
It is really my first venture into throwing and adding a doughnut of clay and throwing yet higher, and I am very appreciative of the kind folks out there in blogland that post such useful photos and technical information on their sites. Not quite as good as actually visiting someone's studio, but a whole lot better than trying to do things in isolation. So, thanks everyone!