A Ruger is a pretty good gun and is generally my 2nd choice when selecting a rifle. I would prefer it by a wide margin over a Remington or Browning. My 1st choice is the newer Winchester models, but the Ruger is good too and a little less expensive. Older Rugers developed a reputation for poor accuracy and that reputation follows them. Don't let anyone tell you a Ruger won't shoot. They made changes in 1992 and again in 2006 that have made current Rugers as accurate as anything else. Some guys just won't let old myth's die.
The chambering is really less important. As an all around choice a 308 is fine, as would be a 30-06, or 270. Any of those 3 will take anything in NA with the right bullets in the chamber. Some will try to tell you that it is a little light for elk. I disagree. With good ammo it is a solid 400 yard elk rifle. The 30-06, 270, or magnum rounds might be more effective at longer ranges if that is important.
Don't make the mistake of buying a dedicated elk rifle and try to make it work on smaller deer and bear that you will hunt 99% of the time. Buy a rifle designed for what you will hunt the vast majority of the time and make it work on those rare chances on larger game. You might be surprised at how well smaller calibers work on really large game when loaded with some modern loadings.
jmr40