My neighbor has a Ruger 77 Hawkeye in .223 - I was not impressed. It isn't anywhere near as accurate as I had hoped (1" groups at 60 yards). Action doesn't seem as robust (heavy duty) as the M77 MK II. Not a pleasant trigger.
I just sold my Ruger M77 Mk II target/varmint rifle in .204 What a huge difference between the two firearms. The .204 was the most accurate off-the-shelf firearm I have ever shot (0.0" group at 125 yards - couldn't tell a 3-round group from the hole by a single round. Worst five-shot group at 125 yards was 3/16"). Totally awesome, benchrest accuracy. Very solid, almost overbuilt.
I suppose the Hawkeye could have been an exceptionally bad one with the MK II an exceptionally good one. Two rifles is not a very good sample size, to say the least.