Different method of testing -- different results.
Offline mode, .target 400.
Using the target reticle (that is what it is there for, correct?), placing crosshair of the "4" mark at the center of the target. Fire. Shell hits almost exactly at that 400 level, albeit a bit to the left of my actual aimpoint. Just to be sure, I line up the center horizontal line on the dot that indicates where I hit, also level with the "4" mark, and fire again. Second dot, slightly to the left of the first, but dead even in terms of height -- right where I would expect it.
This is what I didn't expect. I took a Panzer out. Same target distance. Lined up the 4 mark on the Sherman's dot . . . And the Panzer's shell hit above the Sherman's.
Repeat with T-34 and Tiger, same results.
Not sure that means the gun is "nerfed", but it does seem to indicate the aiming "hashmarks" are different on the tanks, which I would not expect.
I should probably repeat it at different distances.