I've heard persistent rumors about 7600s in .300 Savage for years, and there's enough information on the web about the subject for me to say that yes, they're real, they're few in number, and I need to get one before they all disappear.
Supposedly the 7600s in .300 Savage were made in 2006 or 2007 on special order, as a batch of 300, for a gunshop in Pennsylvania.
That would make sense because the Remington pump rifles have always been extremely popular in Pennsylvania, and the .300 Savage has also had its fair share of popularity there.