Its a great action. Have you glass bedded your rifle, tuned the trigger, made sure the mag box isn't in a bind? A ruger m77 can be made to shoot very well, it just takes a few trick moves. Im wondering what you've done with yours, since you say you "can't seem to get the accuracy out of it".....
Agreed, they are excellent actions. Some of mine have had nothing done to them, some have had homespun trigger smoothing, all have floated barrels, one or two have been bedded. All shoot great and they are rugged and reliable.
Currently I'n Wyoming with my .257 Roberts.Not a MKII or Hawkeye, of which I have multiples, but an original M77. Planning on two MKII's for elk season, a .280 Rem and .300WM.