Because your 22 shorter magazine has no markings It's not necessarily from Winchester. I have never witnessed a 22 short journal that was not the identical outside the house dimension as 22lr mag. I can’t think about how a mag, such as you explained, could possibility be safe when inserted. https://highimpactrounds.com/product/winchester-super-x-20-ga-2-75-in-8-7-8-oz-1210-fps-25-rd-box/