Given that your 22 small journal has no markings It's not from Winchester. I have not noticed a 22 small journal that was not the exact same outside dimension as 22lr mag. I am able to’t imagine how a mag, such as you described, could likelihood be protected when inserted. https://highimpactrounds.com/product/aguila-308-win-150-gr-fmjbt-2750-fps-20-rd-box/