I posed this question to a guide in Saskatchewan and he said to use a .30/06 with 180-grain bullets.
When I asked him why, he said that it was the one load he could be sure of obtaining in the north country.
Apparently he's had some bad experiences with hunters bringing SAUMs, WSMs, and RUMs and either getting separated from their ammo or running short. He then has a loooong drive to Saskatoon to try to find some ammo.
