In the NWT the restriction is 30 caliber and 200gr so yes they will. Whether they would be ideal is another matter. But they would do the trick, just wouldn't be my first choice. The '06 family and the .366 Wagner are better choices when flinging heavy bullets.
no caliber restriction just bullet weight,
5.
(1) A licensed hunter may use cartridges of .222,
.22-250 and .223 to hunt caribou, wolf and wolverine in
Wildlife Region I/WR/01 or U/WR/01.
(2) No person shall use a bullet size under 200
grains to hunt wood bison. R-081-98,s.3; R-057-99,s.
the Yukon goes further as they have a caliber, bullet weight and ME restriction on Buffalo
Firearms and Ammunition
It is unlawful to hunt big game with:
u
a crossbow,
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a pistol or a revolver,
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a shotgun smaller than 20 gauge,
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a rifle calibre less than 6 mm [.24 calibre]; (a .22 calibre [5.6 mm] centrefire rifle
may be used for wolves and coyotes),
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a muzzle loaded or black powder rifle less than 11.4 mm (.45 calibre),
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shotgun ammunition other than a slug,
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full metal-jacket bullets commonly known as “service ammunition”, or
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a silencing device.
Minimum firearm requirements for hunting wood bison are:
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A centre fire rifle, .30 calibre or larger, with minimum 180 grain bullets (premium
bullets strongly recommended) and minimum 2800 ft/lbs energy at the muzzle.
(A .30-06 calibre is the baseline rifle.)
OR
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A black powder rifle, .50 calibre or larger, firing an elongated bullet with a
minimum 90 grain charge and minimum 2800 ft/lbs energy at the muzzle.
OR
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A black powder rifle, .54 calibre or larger, firing a round ball with a minimum 120
grain charge and minimum 2800 ft/lbs energy at the muzzle.
