Mastiff is so ridiculously inconsistent

It's a combination of a really odd spread plus awful, awful hit detection. I hit a Gibby standing still, AFK looting a box, dead center whilst aiming and it gave me a whopping 90 damage. 

Total damage in one body shot is 122 to legends with the Fortified perk, and with 8 pellets per Mastiff shot, that's 15.25 damage per pellet give or take. Meaning two pellets completely didn't register at all on a static target with nothing obscuring my aim, at a distance where all 8 pellets would've landed.