When a bullet strikes anything several things happen:
1. It destabilizes.
2. It loses velocity.
3. It loses mass.
4. It changes direction.
5. It is damaged, changes shape.
ALL of these occur EVERY TIME it is just a matter of degree depending on MANY variables. At 2000 yards, even an undisturbed bullet would have very little ability to cause any serious damage.
A bullet which as been a 'ricochet' , from 2000 yards, would have less ability to hurt you than a projectile from a wrist rocket!