I sight my rifles for a mid range trajectory that will not exceed 2.5". It depends of the caliber and load i am using as to what the maximum range I would be able to shoot a deer at. That way I know I can hold dead on a deer's vitals and if my aim is true, I should be able to drop the deer. I don't have to do metal calculations for hold over or under. I have to admit, that where I do most of my hunting here in the Northeast, a 150 yard shot would be pretty long. I don't think I could see a deer at that range in our woods. I suppose if I hunted field edges there may be opportunities for longer shots, but most of my hunting takes place in the woods and brush where you are lucky to see a deer more that 40 yards away. The farthest I have erver shot a deer in over 40 years of hunting is around 65 Yards.