Given that your 22 small journal has no markings It's not at all from Winchester. I have never found a 22 shorter magazine which was not the exact same outdoors dimension as 22lr mag. I'm able to’t imagine how a mag, like you described, could probability be protected when inserted. https://highimpactrounds.com/product/winchester-defender-segmented-slug-12-ga-2-75-in-1-oz-1600-fps-10-rd-box/