From the 2012-2013 LEH Synopsis when hunting Bison in BC,
-Limited motorized access with snow machines is likely to be necessary for November and December but
snow depths may vary greatly from year to year.
-A Bison species licence will be available only by mail and only to those persons successfully drawn for a
Limited Entry Bison authorization.
-Hunters are prohibited from using a weapon other than:
a rifle that fi res a 175 grain or larger bullet retaining 2712 joules (2000 foot pounds) or more energy
at 100 metres, or
-a bow having a pull greater than 22.6 kg within the archer’s draw length, an arrow greater than 26
grams in weight and a broadhead greater than 8.1 grams in weight and 2.2 cm in width at its widest point.
-Hunters are reminded that under Section 35(2) of the Wildlife Act, anyone who kills or injures wildlife must make
reasonable attempt to retrieve that wildlife, and if it is alive, to kill it. This is particularly important with Bison.
So, one needs to figure out the energy requirements then they can start looking for rifles in caliber.
Ok, so the op is hunting in Alberta, look up the regs for Alberta and see what if any special restrictions maybe implied.
Tight Groups,
Rob