It was probably about ten years ago that Harry Sanford's son began the long process of auctioning off all the family's Automag related assets on GB.
It was fascinating! Everything from one of a kind guns, to prototype frames and parts, tooling, documents, and the rights to the trademark.

Handloaders of the Automag (that sounds like a cool club!) would do well to look up the writings of Kent Lomont.
He did a lot of load development and was, incidentally, a friend of Elmer Keith's

Best Regards,
Jim