I believe there was a slight crimp put in the brass shells at one time. There is a website http://www.antiquereloadingtools.com. They list all sorts of tools for old shells there. These folks could probably tell if I am correct. As an aside I bought some Magtech 16 ga brass shells that take Berdan primers. Anyone have any idea which primers or where I could get some? The October 1964 issue of American Rifleman contained an article on loading brass shotgun shells. Next week I'll make a scan copy and if it is ok I'll post it here. It would be in a PDF format. If it would not be appropriate I'd gladly send it to Dave and he could put it up on the website in proper form. Please let me know.
Frank