Because your 22 shorter magazine has no markings it is not from Winchester. I have not seen a 22 limited magazine which was not the same exterior dimension as 22lr mag. I can’t think about how a mag, like you described, could risk 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/