Raimey,
What is the source of your dims? The link above doesn't have dims,just sources.If your source is a website do you have a link? If it's a book,is it still avaliable?Are the dims shown tied to 9.3x75R Nimrod? is it also listed under another name?
I don't use my electronic mic, rather my caliper. Caliper goes to 6", mic is limited to 1". It is very convenient.
Mike