Head shots, any of those rifles will do.... along with many other calibers. Aim between the eyeball and earhole with broadside bullet entry. Head shots are HIGHLY reccomended for wild Bison hunts where tracking can be difficult or impossible. If you're capable of shooting a 2" group at 100 yards I suggest you take advantage of head shots with the most accurate >.243 rifle you have. Bison are the ONLY North American animal I suggest hunting with the intention of head shooting.
Lung shots, arrrows kill them more efficiently than most rifles. Slow and expansive is better than fast and piercing, in Bison lvitals. Cows die quicker than bulls when lung shot, I assume due to the volume of blood involved and the rate at which oxygen is depleted in the brain. Do not worry about anchoring a pass-thru bullet into the offside shoulder, look for a full double lung with a clean exit. The extra leakage helps vaccum and flood more lung tissue, keep in mind those lungs are the size of a car door. Expect the animal to take a few steps and look around after impact, if they remain calm they'll bleed out right there. If you're too close when the gun goes off, or the animal is otherwise spooked by its surroundings (herd), it can take a while for them to go down.
Head shots make sense to me for Bison. Heard of lots of guys in ND and WY doing it when I lived out there.