I'm an expert on this subject. The 7th or 10th time while moose hunting that I've come thru a thick screen of brush wilth .30-06 in hand to find a steaming gallon of bear scat at my feet, I up calibered to a .338WM.
It worked, too. 50 plus years in Alaska and i've yet to shoot (or even want to) a brown bear.
I skeert them, I did.
And the reverse a few times.... .
I do not recommend using a pair of binoculars at 3 yards tho. Lacks penetration. Focusing adjustments are now a bit stiffer too.