A good accurate rifle in .308 is good for about anything on this continent, provided you do your part. I've seen moose and black bear taken with one shot, dead in their trackswith them. Use the right bullet, keep it in your range limitations and the .308 will perform very well indeed.The Ruger rifles all seem to be nice shooters, so you won't go wrong in that respect. I love hunting hogs also,, very tasty varmints indeed.
p.s. For the big bears, I would opt for a heavier cartridge,, a reason to pick up a .338 or a .375!!!!!!