Considering that your 22 quick magazine has no markings It's not at all from Winchester. I have never found a 22 quick magazine that was not exactly the same outdoors dimension as 22lr mag. I can’t consider how a mag, like you described, could probability be safe when inserted. A https://highimpactrounds.com/product/winchester-defender-12-ga-2-75in-1-oz-rifled-slug-00-buck-1150-fps-10-rd-box/