From my experience it is apparent that Ruger actions are the worst action to build on! They are incapable of any accuracy! These two dear died laughing at my custom Rugers...
.275 Rigby
.308 Norma
Also, built on a Ruger action I have a .257Roberts SA, 6.5-06AI which is showing great promise (with just the fire forming loads) and a 404 Jeffery being assembled as I type.
.257Roberts in Mcmillan UL stock!
Almost forgot the 9.3x62!