Something that everyone seems to be forgetting; is that once the projectile loses it's initial velocity, gravity takes over, and at that point it begins to fall.
Myth busters had an entire show regarding this and proved that while it might be a possibility, it is an imporbability.
I'm not saying that there aren't other variables that might come into play and they may not have covered; but after a mile and a half, I would think that almost all of the initial velocity would have disappeared and it would basically be falling in an arc.
Edit: This is odd.
When I go to edit and try to take out the second "velocity", in the first sentence, it doesn't appear.!!