Given that your 22 short journal has no markings It's not at all from Winchester. I have not viewed a 22 brief magazine which was not exactly the same exterior dimension as 22lr mag. I can’t envision how a mag, such as you described, could likelihood be protected when inserted. https://highimpactrounds.com/product/winchester-defender-segmented-slug-12-ga-2-75-in-1-oz-1600-fps-10-rd-box/