Winchester SX3 Field Black Shadow Inv 20G – The Super X3 has one of the most iron-clad reputations in the shotgun world. For over a decade it has lead all others as the most durable, robust, dawn-to-dusk workaholic shotgun there is. It never gives up. It never surrenders. Period. So, the next time you run into a Super X3 owner pry a bit and you will learn a few secrets about the original “Super” autoloader.