Mirror Lube was adertised as a patented formula (no patent number) which eliminates loading jams and reduces leading. Works well with rifle and pistol and lubricating qualities were unaffected by weather conditions. Can be stored indefinitely and keeps bore mirror clean.
It was mentioned in the first edition of Handloader's Digest in 1962 and last mentioned in the tenth edition 1984. I used a stick of it myself and it seemed to do as well as anything else.