Considering that your 22 brief journal has no markings It's not from Winchester. I have never viewed a 22 brief journal that was not a similar exterior dimension as 22lr mag. I can’t think about how a mag, like you explained, could possibility be protected when inserted. A photo might https://highimpactrounds.com/product/winchester-super-suppressed-300-blk-200-gr-otr-1060-fps-20-rd-box/