I think the "go ahead with Bertram" advice is good.  You will need to anneal the cases before firing, else you will lose a bunch.  Do you have dies?  And can you get them in Canada?  After annealing, try to chamber one of the Bertram cases.  You may need to resize.

Bertram will work, but not out of the box.  Then remember that there are at least 3 versions of the .43 Spanish, maybe more.  Argentine rollers use the bottle necked original rifle version, NOT the Reformado.