Deadringer sight on sbe 3

[Thompson418]

Quick question, I recently installed a deadringer sight on my sbe 3 for turkey season. On the package it says the closer you move the rear sight to the front of the barrel it will adjust elevation to make your gun shoot lower. Also says the further you slide the rear sight back it will make you shoot higher. Does this honestly make a noticeable difference? If so how much of a difference..
Thanks all