I doubt it'll be easy to aim at anything this far away :>
I'm not even sure what the Asp in the picture is firing at, to me it looks as if it was firing at thin air, maybe because the camera is slightly behind the mech and his target is just in visual range, maybe because he was firing blindly toward the incoming LRMs.
I'm just guessing, that the only way to ensure a hit on these distances will be to use LRMs with someone close to the target tagging it.