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I believe there is a screw ya turn just in front of the trigger when it's upside down. Don't do much just lighten it up a bit, got mine from about 9lbs to 5ish.
Its been a while There are there screws: to reduce weight, to reduce travel (creep) and to eliminate overtravel as I recall. It was not hard figuring out which was which. Sorry I don't have an illustration.
Have you tried sending a message to Ruger customer service? If not, send me a PM. I think I have the manual that came with mine and I'll dig it out for you.
The M77V's that I have, have an allen head screw in the top of the trigger. When loosened it takes weight off the trigger spring and lightens the trigger pull weight. If you have excessive creep, I would take it to a gun smith.