"There is no optimum firing range for any rocket. They are either HE (they rely on explosives to do damage), or hollow charge (H.E.A.T. IIRC. Meaning they don't rely on speed to puch through armor)"
Not quite true. The first British UPs ('Unrifled Projectiles') fired in anger were toted by the Fleet Air Arm's Swordfish Mk.II and employed a solid-steel warhead for penetrating the pressure hulls of U-boats.
