There has been so many PVE buffs to everything, 600rpm autorifles are very noticeably weak in PVE.
Infact. You recently buffed 450rpm and now in the TWAB it says you are buffing 360rpms (or 300 and something).
But you have not said a word about buffing 600s, please do.
I just did the beginning of Preservation where ads endlessly spawn and used all weapon types for gunsmith bounties and when I pulled out my 600rpm against a knight I was tickling him with my bubble gun.