I've always had good results with Sierra bullets, both boat-tail and flat-base; spitzers and hollow points are equal, as well. I've mostly used 4064, since 1950.
I tried a book-max load of H414 with 180-grain SPBTs and got a three-shot 0.4 MOA group--and grinned, and quit.
Dunno what to say about Rugers in general. I had two 77s back in the 1970s and they were tack-drivers. I have a 77 Mk II in .223 and it's a half-MOA critter--with no tweaking other than installing a Timney trigger.
Occasional bad barrels? I dunno. Frustrating...
Art