Chlorophyte Bullet

Accuracy stops being your problem. Guns with awful spread become usable, since every pellet curves back onto the target anyway, and that is where these are worth their cost: on shotguns and the fast sloppy guns rather than on the precise ones you could aim yourself.

The tracking has a range limit, so shots fired at something far away travel straight until they get close enough to lock. And if the target dies mid-flight, the bullets still in the air can slow almost to a stop hunting for a new one. That looks like a bug and is not.

The Lunatic Cultist takes reduced damage from anything that homes, so swap ammo for that fight. Target dummies are ignored entirely, which makes these useless for testing your damage output, and Martian Probes cannot be tracked either.

They lock onto mimics and lost girls before either one turns hostile. Firing a shot down a corridor is a cheap way to find out whether that chest is really a chest.