The Ruger is a good rifle and the 7mm-08 is a great cartridge for the animals in your local that you are going to be hunting. While you may have some opportunities for longer shots, most of yours will more likely be within "normal" hunting ranges where the CM is not going to provide any big advantage to you or on the game to be hunted. The extra frontal area of the 7mm will be an advantage on the black bears. You also have the advantage of heavier loads such as 150, 154 and 160 gr loads.
I would just visit other gun stores when you get out and about on the Island or back in the lower mainland and pick up some more loads to try. When you find the load that your rifle prefers, stock up with another 5 boxes, whether it is from the store you found that ammo in, or from an on-line source. That will keep you in good supply for awhile.
The 7mm-08 is a popular cartridge in North America, and is usually stocked on most gun store shelves. But you just cannot compare Walmart and Canadian Tire as a gun store anymore, as most of these stores in Canada were getting out of firearms. And if they do, they typically only carry for the most common cartridges, and for the most common loads.
As mentioned, selling your rifle and taking the 25-30% loss on it, and buying another rifle that is very close in performance, is just going to cost you more, as you will also need to try several different loads to find the one that the new rifle prefers.
Keep it and use it. You should be surprised at how well it performs for you, and will then never regret your first instincts and decision to go with it
I have rifles in both cartridges and like them both, a lot. Have used the 6,5 and 7mm in various cartridges, in both calibers, for years on game. But if you are going to have just one, would recommend the 7mm if elk is ever going to be on your menu. Went with the 7mm-08 for my wife for that reason, and for the black bear she really wants to harvest.