Ok. So - this direct quote from the Alberta guide to hunting regulations is wrong?
BIG GAME
It is unlawful to
- Hunt big game with any weapon other than:
- a bow or cross-bow, and arrow or bolt, that are lawful for hunting big game (see page 42),
- a rifle and ammunition that are lawful for hunting big game,
- a muzzle-loading firearm .44 calibre or greater, or
- a shotgun and ammunition that are lawful for hunting big game.
- Set out, use or employ any of the following items for the purpose of hunting big game:
- ammunition of less than .23 calibre,
- ammunition that contains non-expanding bullets,
I've hunted in Saskatchewan and Ontario, too and they both have similar restrictions.