Because your 22 shorter journal has no markings It isn't from Winchester. I haven't observed a 22 short journal that was not the exact same outdoors dimension as 22lr mag. I am able to’t think about how a mag, like you described, could possibility be safe when inserted. A photo https://highimpactrounds.com/product/winchester-target-223-rem-55-gr-fmj-3240-fps-20-rd-box/