I wonder if the bonuses only apply when ADS'ing? Here's why: Range Finder versus Hammer Forged. If you have a gun with Hammer Forged and select that perk, it displays a visible improvement to the range rating, because Hammer Forged's bonus is "always on." If you select Range Finder, the range stat doesn't visibly change. But the text says "when aiming." The perk probably doesn't cause a visible change in stats because it's effect is situational and not "always on." Maybe the improvements are either very slight, kind of like how most impact perks barely increase the rating at all, or only affects the gun when aiming down sights (and Bungie needs to update perk descriptions appropriately). On a side note, Bungie should have things like Range Finder display their bonuses with Yellow, so you can tell it's not a "always on" bonus but still see the amount of the bonus of you were to aim down the sights and thereby activate it.

I dont use it , the iron banner rocket launcher is the best for crota raid on hard if you dont have a ghorn