Just wanted to add on the little experience I have with wilderness carry stuff in my region here in BC. I know directly about 3 local people who got one:
1. "trapper" who got a carry permit for a .22lr pistol to assassinate poor little furry creatures. I say "trapper" because he does have a permit/license for trapping, and a line somewhere, but he certainly doesn't make a significant living from it. He subsidizes his trapping hobby as a heavy equipment operator.
2. geologist who got the permit to carry some sort of wheel gun - I believe .357 (definitely not .44mag).
3. "prospector" who got the permit for his 1911 (yup, wimpy .45acp). Again, this gent has a day job (some sort of administrator) and his prospecting is really a hobby. He hasn't found anything in the last 5 or 10 years, if ever. He does a lot of his prospecting around Nelson...perhaps he is very worried about being attacked by stinky hippies.
So - 22lr to kill critters has definitely been issued at least in BC to a registered but non-professional trapper. There aren't really caliber requirements - only suggestions. And you have to remember that the government doesn't get to tell you who you are or what you consider your profession to be - you tell them. So, if you are a prospector then you are a prospector, regardless of your day job. It isn't entirely true for "regulated" professions and trades, which includes "trapper" here in BC, but it is certainly true that you don't need to be a professional geologist or whatever to get a carry permit. Just fill out the form with conviction! And pass the proficiency test.