However, I believe I might know the answer to your question, 44 AMP, if it is as simple as I am thinking; is it because the greater amount of momentum in heavier bullets keeps them going in a straighter line?
It's not quite that simple. (there a little guy, seems to be dressed like the Cowardly Lion, hopping around and chanting "I wanna tell em! I waanna Tell em!!")...
A situation as you describe, does exist in our shooting world. (find that, for extra points!
But that set of circumstances is not the answer to my question.
Did you know that with handguns, lighter bullets will generally strike the target lower than heavier ones, with the same point of aim?
This would seem to be the opposite of what one expects to happen, but I assure you it is true. Heavier bullets move slower than lighter ones, so they ought to hit lower, but that is not the observed result. Why?
note the italicized word...