I've owned over a dozen Rugers over the years, and only had a problem with one
(7mm-08). Overall, the accuracy and reliability of Ruger rifles has been very very good, if not outstanding. I currently have a Ruger carbine in .358Win. that, using factory
ammo, will group 5shots at 50yds into no more than 1/2" when I do my part.
My .308Win. (mod.77RSI) seems good for 1" or less a 50yds with several different loads.
I'm still experimenting with this one to decide on the best load.
When I lived in Wyoming I recall another .308Win., a 25-06, and a .243Win. I had.
All would shoot into less than 1-1/2" at 100yds. (the .308 had the action bedded, and
free floated the barrel).
With the newer Rugers (MK II), you may need to have the trigger pull weight lightened by a gunsmith, or replace the trigger with a good Timney, etc., but that's up to you.
Triggers on the new models are not readily adjustable as they were on the old ones.

Remember that each rifle is sort of an individual when it comes to the ammo that will shoot best in it. Try several different loads to find what shoots best in your particular gun.
Good luck.