use the lighter weight bullets for open fields and the heavier {180} grain for brush.
I use 180 grain all the time for every situation.
While you might only “need” 150 grain for a deer, 180 grains will put a deer down. It will also be just about perfect for bear, elk, feral pig and cougar. It will also kill coyote just fine.
As a practical matter the sighting differences, between 150 grain and 180 are very small. I don’t shoot anything over 300 yards anyway, most shots are 100 yards or less, and this is in the west. In the eastern states even closer is normal.
If I don’t change bullet weight, I don’t have to go through a lengthy sight-in process every time I hunt for a different species. I just check the sighting with a few shots before each hunt. And if a bear or cougar shows up on a deer hunt, I am ready.
Just try a few different brands to see which does best in your rifle. Mine likes Remington, which is a shame since Winchester is more common in my area.