This is what dad has used on several Ruger 77 Mk II's. Not sure the difference in the new trigger, but I guess they're similar.
When the picture opens up you'll have to click on it to zoom in for the writing to clear up, at least on my system I had to. The embedded image won't be clear at all, but going to the page will be ok.
http://www.centerfirecentral.com/images/trigger.gif