Since your 22 short magazine has no markings It's not necessarily from Winchester. I haven't noticed a 22 brief magazine which was not the same outside the house dimension as 22lr mag. I am able to’t consider how a mag, such as you explained, could likelihood be safe when inserted. https://highimpactrounds.com/product/winchester-super-x-308-win-180-gr-pp-2620-fps-20-rd-box/