[Pressurized Magazine]? [Lethal Torrent]? [Barrel Diffusion]? [Magnum Force]? Come on, it couldn't be named anything else.

The main goal is to empty the bladder as quickly as possible and yeet it straight into the face of your enemies. Full reload from empty has greatest crit chance and damge, no point in doing a short reload. Pressurized Chamber ensures that so long as you're aiming you'll have plenty of angry water balloons to go around.

Main fire has terrible ammo efficiency but good status chance. Keep on heat to strip armor more effectively than corrosive (doesn't have a max stack and also applies DoT). Pistol ammo mutation is a must-have; if you want to use Primed you can either drop [Pistol Gambit] down or lock in [Pressurized Magazine] with a final forma.