As I recall from sighting in the 180 after establishing a zero with the 150, the 180 printed a similar sized group, just offset a few inches at 100.
I gave it a few clicks and got it centered on a 6 inch bull. A couple of weeks later, I was sitting on a stump watching the buck walk towards me at 125, parallax was set to 100, he paused, boom
i saw feet in the air thru the scope as he flipped over.