Okay, I officially give up on shotguns.
I was a huge proponent of them, but they are completely hit or miss. There have been multiple times when my reticle is 100% smack dab unquestionably on a target in perfect shotgun range only for every pellet to somehow veer completely to the left or right of the target, or where despite being pellets it randomly practically acts like a slug perfectly grouped on a tiny dot, but only when the reticle is just pixels left or right of center despite them still being well within the circle.
Like, within 3 minutes I went from headshotting a guy from across a large house when they were outside the door, to missing four shots on a guy walking into my room, to headshotting a guy walking into a room, to painting an outline around a guy who didn't even see me and was looking in the opposite direction while slowly strafing.