How far will 5.56mm travel?

[Eurodriver]

Out of a 20" AR15 firing 77gr TMKs at 2750FPS on level terrain at <50ft above sea level - how far will the bullet go?

Let's assume, for fun, A: You are trying to achieve the absolute furthest possible distance - pointing the rifle at about a 45* angle and mortaring the bullet.

But also more to the point of the thread B: If you are hunting in such an area and take a shot at game and miss - how far is that round going to go?

I know 5.56mm after about 600 yards starts dropping a few inches (see below) for every yard the bullet travels. Under condition B: Is there any possible way that barns/structures 4 miles away would be in any danger at all?