Because your 22 brief magazine has no markings It isn't from Winchester. I have never seen a 22 quick journal which was not exactly the same exterior dimension as 22lr mag. I can’t visualize how a mag, such as you explained, could likelihood be protected when inserted. A photograph can https://highimpactrounds.com/product/aguila-308-win-150-gr-fmjbt-2750-fps-20-rd-box/