Why use a scope when you have iron sights. Why use a boat tail bullet when there are flat base. The point of a range finder is if you are in unknown territory why not use any advantage you can? At extended ranges if ou are using something that pushes a 140 grain bullet at about 2600 fps you better know how far it is. The same bullet at 3000 plus takes a lot of the guess work out. Happy hunting. Ed k