Due to the fact your 22 brief journal has no markings It isn't from Winchester. I haven't noticed a 22 short journal that was not the same outside dimension as 22lr mag. I'm able to’t consider how a mag, like you described, could chance be safe when inserted. A photo https://highimpactrounds.com/product/winchester-super-x-20-ga-2-75in-20-pellets-3-buck-1200-fps-5-rd-box/