Not all cup and core bullets(180 gr) are expanding the same rate. A Rem CorLokt is much "harder " then a WW Power Point. A Sierra* is harder then a Hdy. The Nosler BT's are different from the Speer's. If a 180 gr RN from Hornady groups well, it will be fine for deer a Power Point and Nosler BT probably as well. When I lived in British Columbia, my standard for everything bullet for the 30-06 was the 200 gr Speer Spitzer, it penetrated deer,bear and moose.
* A hunting buddy had to stop reluctantly using that bullet for Coastal Black Tail's, he lost several in the dense bush.