If the wiki information ( Tmp pages...) are correct( I trust it ), you should be able to reach the 21 range with any throwing weapon with 3 strenght and heave oh.
With the build i linked you'll truly struggle with the hp's depending the situations, it's going to be error-less moves or you're dead in 2-3 hits, it's possible to remove a few perception from 9 to 6 or even 4 ( you'll have the equivalent of 6 PE of sight range with sharpshooter...) Also TB fights will remove your sneak once your turn ends, so make sure you're not a potential target once you finished moving, I'd stick to RT with this build kill a few target, sneak and look how it's going, regenerate all AP then attack if you have windows to :p
8 Intel for the Educated perk giving you +2 bonus SP each level. some science books may be required or you'll only be able to get it at level 2-3, don't forget the gun runner dialog weapon skill "reward" giving a few in throwing ( "Fight silently and from a distance line )