Have been using a 6x42 for the time I've had my own rifle, but I've just stuck a 3-18 Z6 on top and I'm liking the 10x, but I've yet to christen that one with a deer. I think it makes sense to use the same power as your binoculars or above. Found a few times that things i could see well through the bins suddenly weren't so easy to pick up with the 6x scope, either in cover or at longer ranges in Scotland.