Steve, thanks for the information. I am convinced that someone somewhere has the production records but it will take considerable detective work to find them. Double guns and rifles have a history and will be an interesting bit of research to discover.
As to reloading dies RCBS offers the following: 56618 .500-450 #1 EXPRESS 3-DIE STEEL SET, however, there is no details as to whether they are 7/8"x14 or 1"x14. Do you have a recommendation as to which manufacturer (i.e. RCBS, etc.) supplies the 1"x14 dies?
Thanks in advance.
