Imagine that we are to throw an object at some angle with some initial velocity. Then, the distance this object will cover in the horizotnal direction is
$$x = \frac{v_o^2}{g}\sin({2\alpha})$$
What's the approximated error the distance would decrease if we were to take into account the air resistance (assume no wind) ?
Let's say that this object is a bullet fired at about 300 m/s, 0.0042 kg