Forgot to mention.
On the above link, click on the various mold links as there are several versions of his Sharps molds.
The question I was trying to get an answer from him for was "what are the differences?", "what are the dimensions or diameters of the rings?"
The mold I have may be a little too small as it goes about a half inch too far into the breech. (if I fill in the breech with powder it takes 120 gr ! Bullet is 500 gr)
Let me know if you find sources of info.