Why would it be so hard to get brass? Alexander Arms can supply it no? If they wont ship it to Canada get Questar or someone to import it or go pick it up at the border. Make sure to get a hunting licence in one of the states in case of check stop before border. Just buy 500 or 1000 at once and you will have a lifetime supply. Its not like you will be rapid firing cases at the range with a beowolf. I kinda want one too but, its down on the list.
pretty sure brass is ITAR controlled. so one would have the fun of doing crap tonnes of paper work to bring some across, but as you say 1000 is a life time supply.