Problem Ranged build this: not mobile and restrictions by overheating/ammunition/accuracy(bolter) heavy build less speed more, 

more ranged weapon cant kill danger target because others are covering them. and slow speed help this.

than ranged weapon better? nothing? the shelter system does not work (hi-lvl all timer).

This is my personal opinion, I am only level 53 Сrusader, someone plays with Ranged Weapon in Warzone 3800-4000+ or city of suffering get 13-16 chest?