I'm with M.Sneak. If you ask a gunsmith about rates to do trigger jobs, he'll ask you what kind of rifle you have. If you say Remington 700 or Winchester M-70, listen closely for the sigh of relief he lets out, as he quotes anywhere from $30-$60. I know one guy (semi-retired) who was doing them for $25, 3 years ago. But just say "new model Ruger M-77", and watch his face screw up. He'll say "replacement trigger group" so fast your head will spin. My acquaintence in N. TX used to do teh New Model Rugers, but he said it was so close to impossible, most gunsmiths will simply tell you it can't be done. In that case, you're into $65+ for a Timney or like trigger, + fitting and installation.
Good luck!
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Will you, too, be one who stands in the gap?
Matt