SK Magazine is sorted from SK ammo that is factory-rated at 1073 fps. It is the lowest in the heirarchy of that variety of SK ammo. It's reported to be greasier than other SK ammo, probably because it is packed in a can-like container in which the brass can get bullet lubrication on it making it greasier than ammo that is packaged individually in boxes. It is the most economical SK ammo.
