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The rifle you buy should be enough to fuck up anything that lives with the deer. Where I live we have Sitka Blacktail deer. They are about the size of a Doberman with little stick legs and I bet I could kill one with a BB gun. But we also have bears, big fucking giant bears. You sit there hunting terrified of being ripped apart by an eating machine that runs 35mph. Then the bad thing is they eat you alive, unlike a large cat who kills by neck holds. You have to wear suspenders because of the weight of all the pistols on your hips loaded with hardcast.
tl;dr .308 or 30.06.