I have only owned three Ruger 77's but have shot a few dozen. I have glass bedded, re-barreled, re-stocked, and repaired, a few hundred. I have seen very few which could not be made to shoot very well. The early tang safety models, with the flat bolt handles, had nicely shaped stocks. With the advent of the heavy barreled varmint models, they made the fore arm fatter to accommodate the fatter barrel. They decided to make all the stocks the same after that and kind of spoiled the design.
The tang safety trigger was fully adjustable and could be set up fairly well. The MKII trigger was non-adjustable but was simpler and more foolproof. Neither is a great trigger. The trigger on the newer varminters is a very good trigger. GD