I've got a .270, .223, and 7mm-08 all in m77. You can't go wrong with them in my experience.
It just happened to work out over the course of the last 10 years I've somehow bought 3 ruger m77's not sure how but I've got no complaints with them to this point (although I have a very serious itch to sell the 7-08 and buy a browning x-bolt in the same caliber for no particular reason). I've spent time at the range finding their favorite factory load and all 3 will hold a group of three that can be covered with a quarter at 100yds. The .223 will group 3 in practically the same hole but I've spent the most time practicing with it too.
The one thing I have done to all 3 rifles though is floated the barrel and sanded any burs that may be present in the rifling at the end of the barrel.
Looking at the ad you linked I thought the price might be just a little steep for a blued rifle but looking at the
Ruger website it shows that price might be somewhat fair.