With a nice hunting rifle used for a max range of 400 yards(at an unshot animal) a single-power scope is smaller, and makes for a sleeker, easier-carrying rifle. My choice is a 4x with a 1 or 2MOA dot. When you "drop down" on a deer-sized animal, you will, from practice, compare the Lee dot to the animal for your range-estimation.
If the rifle is sighted in...3" high at 100 yards, you'll be able to shoot at anything at or under 300 yards by aiming where you want to hit, and raise the dot a little out to 400.
At 400 yards, a 2 MOA dot displaces 8" and you will have part of the deer above and below the dot. If there isn't silhouette larger than the dot...it's too far. You can do that almost instantly, because you've been practicing...haven't you??? You owe that to the animal you're about to kill.
I do agree that 6x may be better, because you can see the target easier, but I don't believe it's NEEDED. Variables are built as much or more for replacing binoculars.
You use the 3x, 4x or 6x to shoot with and the others to scout with.
The "Tacticool" scopes are fun to play with, and the competitions they're used in, are great to shoot more, but they really don't fit in hunting.
You don't usually don't have time to measure the distances, adjust the scope for trajectory, allow for wind, and squeeze a shot.
This is the reason you've chosen a nice hunting rifle, in a flat-shooting cartridge.
I've played as much as I can with the high-powered scopes, in several long-barreled rifles, with a selection of cartridges from .257 AI, through .264 WinMag to .300 WinMag.
My "all-around" "go-to" hunting rifle right now, is an FN Mauser, .270 AI with 2-7x Widefield scope with fine crosshair reticle, so I don't necessarily follow my own advise, but it's close.
I seldom see "perfect" or even "excellent" conditions, so that's why I put 400 as a max range.
Have fun,
Gene