This might seem wierd but I would take my mossberg 500 with rufled barrel. Some would say "that's a shotgun" but I would use it for everything. Put a smoothbore on it and you can hunt small game. Rifled barrel would allow me to take grizzlies with some of those high shock rounds.
2 primary go to rifles. One is a Tikka Whitetail hunter 30-06 with a Nikon Monarch 2-7x33. And when the weather gets crappy, I now have a Browning Abolt stainless stalker 30-06 with a Leupie vari-x2 3-9x40.
Although in my previous post I stated that I like the 30-06 and 308. Running a close third is my M48 which I converted to a scout rifle with a stock change, and Burris scout scope (No Bubbaing here, not that there is any collecter value here). Its great for hunting pigs and a hell of alot of fun at the range.
The only downfall of the 8mm is US makers load it to 30-30 ballistics and neither US nor Euoropean manufactured ammo is as available as the 308 or 30-06 although properly loaded it the 8mm will do anything they will.