Ken

Later today I will try and scan the article, if there is someone willing to post it I can then e-mail it to them so all can read it, I would do it myself but am a computer idiot without the first clue.

The bore size resembles more a "true" 4 bore diameter than a 2 bore, the case is based on the old Holland 2 bore shotgun cartridge. The article gives further infomration and is 3 pages in length

Jonathan