There is a line in the new patch notes today that is interesting: "A number of scopes have been updated to ensure a larger playable area is visible when Aiming Down Sights"
I wonder if this might be referencing scope FOV/magnification values. If I recall, many of the scopes don't actually apply the stated magnification as they do in previous BF titles. Instead they apply random/arbitrary values where the magnification is typically greater than the stated magnification.