Nope, its possible for the bullet to stabilize longer distances, and you might get simular groups at 200 as 100, but never smaller on average.
In other words, not out of the question to 1.5MOA at 100 yards, but less than 1.5MOA at 200 yards. So you could get 1.5" groups at 100 but might be smaller than 3" at 200.
But in this case on average the 400 yards group will be smaller.