The set screw in the trigger on old 77's just works on the trigger return spring. To really adjust the trigger it's necessary to take the action out of the stock. The sear engagement and backlash are adjustable with screws in the trigger housing. My 77 has a perfectly solid and safe 3-lb trigger that hasn't varied in over 34 years. It helps to have a schematic of the trigger group. Of course the best bet is a gunsmith or advanced tinkerer who knows what to do for you. Still, anyone with a spoonful of sense can figure it out for himself with a diagram. Old Ruger ads from the early 70's had a great color x-ray of the 77 action...it's what I used to figure out how to 'fructify' my trigger.
