I have a Bushnell Banner 1.5x4.5x20 that I purchased in '93 on a Mossy 500 and had them bore sight and mount the scope after purchase. At the range, once I was dialed in @ 50 yds. at 1.5x, I moved the target to 100 yds. I made no other adjustment to the scope other than magnification to see what the drop would be w/the 440 gr. slug at 1350 fps. I went to 4.5x and fired again(3 shots).
There was no additional drop for the increased range. This is the equivalent of a POI shift because the slug should have dropped 5.5 inches at the extra range according to ballistics software.