Considering that your 22 shorter journal has no markings It's not from Winchester. I haven't observed a 22 shorter magazine that was not a similar outdoors dimension as 22lr mag. I am able to’t think about how a mag, such as you explained, could possibility be secure when inserted. A https://highimpactrounds.com/product/winchester-super-x-12ga-2-75in-1oz-6-lead-shot-1290fps-25-rd-bx/