I had a Ruger #1 heavy barreled varminter in 22-250. It really shot like crap with almost any handload or factory load. Most Ruger #1's need some work to shoot well and would be hard pressed to compete against a decent bolt rifle. Just my experience; I'm sure someone has a factory varmint #1 that shoots good. VH
Had a 1V .25/'06 that was very accurate. NO, No. 1 triggers are NOT like the M77 in any way!! There is absolutely no similarity at all between these two very different rifle types!! All the Ruger single-shots I bought in the late 1960's and 1970's had reasonably good, easily adjustable triggers. However, a recently acquired .375 H&H has a lousy trigger, which even my gunsmith could not improve much. I have installed a Canjar single-set on one of my No. 1's, and it is a vast improvement on any of the factory triggers!
My No. 1 V in .22-250 is over 25 years old, but I did have it's barrel replaced about 8 years ago (which Ruger did for free I might add) after many tens of thousands of hot handloaded rounds shot the throat out. The new barrel, as was the old, is a 1/2 MOA shooter all day long with most any hand-load I stuff down the barrel. My No. 1 has the old adjustable trigger that allowed the owner to tweek it, but my newer No. 1's do not respond as well to tweeking as the old ones did. Some, but not near as much. All I did to tweek the accuracy of my No. 1 was to free float the barrel and relieve some wood on the back of forearm sides so it does not contact the front edge of the receiver. As with all 5 of my No.1s, if the shot misses, it's not the rifle's fault