This is a S.W.A.G., but, I think you got it here:
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Is the Physics of it: Lower velocity = More time in barrel = Greater lift to trajectory caused by muzzel flip. with A heavier bullet (all other things being equal) yielding a lower velocity.
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My feeling is that the gun has more time to recoil before the bullet leaves the bbl, ergo, the shots print higher with heavier ammo. These are ball loads I'm talking about, so both would be full powered. 
One of the scientific minded members might be able to give you a mathematical reason why, I can't. I just go by my observations.
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