I spoke at lenght about wolves, with a friend of mine in the interior of BC, that works on a ranch that is losing a LOT of stock to the wolves each year.
He wanted an opinion on a decent caliber for long range shooting, I suggested a 7 Rem Mag, with as good glass as he could afford, and as good a range finder as he could afford, even if it meant cutting corners on the glassware. All they want is dead wolves. The government trapper/hunter is only able to put a small amount of time in to the effort, and frustration builds...
I told him that a 300 or 338 Win mag would also bear looking at, if he could stand packing the weight around.
Honestly, I've seen two wolves. One in Northern AB (Peerless Lake area, boondocks!) and one in central BC, in the upper Yalakom area (also boonbocks).
I think big game rifle, rather than Varmint rifle, is a better fit.
Cheers
Trev