Yes, please enlighten us...Where in BC is there a caliber/cartidge restriction ?(except bison, where you need a certain power level that does not exclude a .375?)
In BC we have ARCHERY ONLY zones and SHOTGUNS WIHT SHOT ONLY zones, but anywhere you are allowed a centerfire rifle, you can use a .22 Hornet or a 50BMG...
can you hunt everywhere in BC that it is legal to hunt with a 375? no. anywhere you can hunt with a centerfire rifle. yes.
there is no such thing as the ultimate rifle and to add one legal qualifier (big 5 in afrika or bison in BC), means you have to add other legal qualifiers.... muzzleloading RIFLES in strathcona county, sub 270 in parts of ontario and ireland, no former military calibers in many other countries.
it might be possible to load a 270 weatherby with 180 grain bullets and be legal for bison in BC and fit in ontario and ireland and all the no military cartridge countries, but this wouldn't work in afrika or strathcona county (which has some tremendous whitetailed deer) or large parts of the US (why are there so many new slugs and slug guns???).
just the other day i was in some thick steep timber wishing my rifle barrel was 6-8" shorter and i didn't have a multi hundred dollar scope to break my fall on some moss covered scree. i actually thought a revolver would have been perfect. later in the day i was glassing the edge of a hayfield on the far side of 300 yards.
the ultimate rifle to me would have to be adequate for elk to 400 yards, legal for elephant (let's go with that since i can't get excited about WT deer, or lets add interchangeable barrels, i could get excited for drinking guinness and hunting red deer in ireland though), short and light for climbing in the timber, fit in a saddle scabbard, weatherproof, look nice, be stocked (with wood) for open sights and a scope, be built on a mauser action either 1909 or 1935. have light enough recoil so that i can shoot it well and my son can shoot it, and do this without handloading tricks, one rifle-one load. not to mention accurate.