I have a 770 & talk with a lot of people that have them so here's the deal. They are either great or bad, the quality control at the factory is below par bc it's a budget firle so as long as they fire semi straight they send em out the door. The trigger is a little squishy & the bolt isn't great. However you can easily get used to the trigger & you can fix the bolt. The bolt sets & slides on polymer. You can heavily break it in by working the bolt or even rake high grit sand paper to sand down JUST A LITTLE! Also, factory Bushnell optic is retarded & has a lot to do with the accuracy, if your shooting that scope I'd be surprised if you could have a group less than 3" wide. All that being said, I LOVE my 770. I slapped a $100 barska 6-24x50 scope. Have the bolt smooth as hell. & I'm used to trigger so it shoots great. I have the 300 win mag. I have now free floated the barrel & seen significant accuracy improvements but before fre float it would shoot 1moa at 100 yards, good for deer hunting. Also a lot of their bad name comes from the fact that most people who buy cheap rifles aren't experienced & blame bad shooting the gun. Bottom line it's coyly be a decent gun or a great gun depending on cal & the particular rifle you buy, & you will HAVE TO replace optics for an accurate scope.
Here's my best group before free float (after this shot I adjusted & hit close to center on other targets)
Here's my average group after free float (shots left & right was me re sighting gun & now has 1/2moa accuracy)