Because of the diversity of hunting ground in BC, there would be no suggestion that would be correct for all species, in all areas.
For example, "driving screws into wood is best done with a Robertson's bit screw driver, but in a pinch can be done with a hammer".
That being said, I hunt big-game almost exclusively with a .30-06 and a few years ago bought a .340 Wby for hunting moose and growly bears up in the northern country. I would use a .30-06 or the .340 interchangeably, they will both kill moose and bears dead. However, I recently bought an Ultra Lightweight .257 Wby to use when hunting sheep and goats, up in the mountains. If I could only have one of my rifles to hunt anything and everything in BC, I'd have to take the .30-06. More than adequate for moose and grizzly, range'y enough for goats and sheep and it's not overkill for deer or wolves, coyotes, etc. It'll do what you need a rifle to do, anywhere in North America. If I have the option of a few different rifles, that's when I would pick the .340, .257 etc. etc. etc....
And, just for clarity, I am not an advocate of the "One Rifle" line of thinking, it's just that the .30-06 wouldn't have been around as long as it has if it weren't pretty great. Gotta have variety though, or it'd be pretty boring if we were all walking around in the woods with the same ol' ought-six....
CLINT
and Elk/Blacktail also, where you had to pick a spot in a clear cut, could not cover it all.
