For my long gun Im using the bonesaw with overflow and bandit mut. And I’ve been switching the sidearm around depending on the situation but I’ve found that enigma works well in many many situations with many different mutators. I’m still not done with my first run through though, so I’m still on the lookout for a new favorite lol
I don’t have very many mutators atm, but I’d say either bandit or the one that increases ranged damage as you pickup ammo