I found this web site this evening. I'm not sure exactly who is running it, but it does have info on a variety of Ordnance items. Everything is located in individual Pdf files available for download, listed under a variety of subject headings. It is far from complete, and uses computer generated images for a high percentage of its graphics, but I'm sure it can be a valuable resource at times.
http://www.ammunitionpages.com/
http://www.ammunitionpages.com/