I haven't had any experience with the 770. I understand it's the offspring of the 710 which is held in poor regard by many. It's probably an acceptable rifle for most people's needs, but the design means it's hard to change things like trigger pull and floating the barrel. If you are interested in "tweaking" it to your specifications, may I suggest looking at Howa, Savage or Stevens which are not much more expensive and offer combo scope packages as well (at least the Savage does and the others might). If not, it may suit your needs fine.
la plus belle des ruses du diable est de vous persuader qu'il n'existe pas!