The two most important things to do to a Ruger are, IMHO, float the barrel and tighten the action bolts properly(very tight up front, jut tight enough to keep the rear from backing out).
Action tightening is the most important of the two unless shooting long strings. My first Ruger (M77 in 7mm RM in 1982) would shoot higher and more left the longer I shot it. Floated the barrel and that problem went away. Since then I have floated the barrel on all my wood-stocked bolt rifles before they go to the range. Smoothing the trigger also helps, but to a lesser extent. All mine, except the VT which has a good 2-stage, have been polished - an easy job a person can do themselves.
Still have that 7mm RM and it still shoots great 38 years later.
I know you love your m77's, but theres a few good reasons for glass bedding them.
1. Keeps the stock from cracking. Have seen a few unbedded rugers succumb to this.
2. After glass bedding, action screw torque isnt as critical.
3. Shrinks groups considerably.
4. After pulling the barreled action and putting back, there wont be a poi shift.
