I don't know about the rest, but I shoot multiple deer each year, legal for xtra does, they are thick here in Ks. take most shots at about 80-120 yd. long shot 225yd. I always leave my 2-8 Leopold on 5x, (my lucky number)
When I see a deer or group, I stay still and don't take my eyes off them, and quickly make a decision and then starch the unlucky one. 3006 165gr. never fails, I have never had a deer not fall dead. Seems to me that when we talk around the campfire more guys go home empty because they wait too long, or mess around with their gadget scope. I am talking about a clean safe shot with backing, saftey first, messin with your scope just invites a dose of the dreaded disease, "buckfeaver" If it is your fate to kill a trophy, he will come out first.
besides, all Ks. deer taste real good.
If I buy another scope for deer hunting it will be a good quality 4-6 fixed. you can buy one for 1/2 the cost of comparable variable.