Considering that your 22 shorter magazine has no markings It's not at all from Winchester. I haven't seen a 22 brief magazine which was not a similar outside dimension as 22lr mag. I can’t imagine how a mag, like you described, could likelihood be safe when inserted. A photograph could https://highimpactrounds.com/product/winchester-defender-segmented-slug-12-ga-2-75-in-1-oz-1600-fps-10-rd-box/