Not my original idea, but one I came across while browsing some shaving forums. I believe the inner diameter of the 44 magnum case gage is the right size to hold the AS-D2 properly.
If I had a 3D printer, I would try making a conical holder that the case gage could be inserted into for more stability.
http://www.dillonprecision.com/content/p/9/pid/25548/catid/3/Dillon_Handgun_Case_Gages
If I had a 3D printer, I would try making a conical holder that the case gage could be inserted into for more stability.