Not 7600, but earlier 760.  A buddy had one - stupid cold - like minus 30C or so - I am quite sure his was chambered in 270 Win - I picked him up, in a pasture, with my truck - as was our practice, there was a round in the chamber and a full magazine - he could not get his action to open - his rifle was frozen shut, whereas my bolt Win Model 70 popped open easily.  We set his rifle on the dash of the truck with fan set to "defrost" - had coffee and decided we were too stupid to be out in that cold and looking for deer that day - once warmed up, his rifle opened easily and ejected the chambered round.
Some years later, I met up with a different guy that I had worked with at a Sask. Potash mine - we both had 308 Win rifles at that time - his was a Parker Hale and mine was that Win Model 70.  He was working at the salt mine at Goderich, Ontario when I later met him - by then, he had a Model 760, but I do not recall what chambering - he claimed it to be the most accurate shooting rifle that he had owned, up to that time.  From our thinking and various discussions at that time, it would have been chambered in 308 Win, or a 270 Win, or a 30-06 Springfield.