I love making weapon based builds so here is my second one with Hellborne Rifle.
[EDIT] GT Link : https://www.grimtools.com/calc/1NXmBn32
I think Hellborne Rifle is pretty overlooked. Inqusitor WPS are amazing as well as the conversions from pyre rings they just snipe with chilling round or shotgun with storm spread.
I did SR 76 timed with 1 death. SR 77 untimed because couldnt figure out ravager.
With this build you should charge in and shotgun the bosses due to them being in your seal and you being in your seal turns the tables. If the boss is hard or ranged you can also range them no problem. I was farming 75s easy sometimes tanking 2 bosses at the same time because I am dumb and dont know how to pull.
[Edit] Forgot to Addin that build has %88 WPS
SR 76
I generally tried to shoot for an effective DA of ~2900 (DA + monster OA shred) Some players feel comfortable with less others feel squishy at that level. I mean you can pilot builds with 2600 effective DA, if you play carefully + are very good at positioning/ watching debuffs. But generally playing with that low of DA isnt a good idea, unless you are gaining a large offensive power (damage boosts, crit damage, OA) in return for doing so