Not sure....but I think RANGE is not measured in FPS. Pretty sure RANGE......is measured in feet. Or inches. Or meters. Or yards. Or miles. Or even Klicks...if you are familier with that term. But not...FPS. Unless you are saying "My BB traveles 450' per second."
In other words. How far does the rifle shoot?
Again, not sure....but I think the meaning of the sentence that your scope is overkill, does not refer to the SIZE of the scope in camparison to the rifle to which it is attached, but that the USE of that scope might be a bit much for the rifle since it most likely doesn't shoot as far as that scope can see.
Somebody square me away if I'm a little wrong here...