Considering that your 22 short magazine has no markings It's not necessarily from Winchester. I have never observed a 22 small magazine that was not the same outdoors dimension as 22lr mag. I can’t picture how a mag, such as you explained, could probability be secure when inserted. A photo https://highimpactrounds.com/product/winchester-super-x-16-ga-2-75-in-6-1-oz-1165-fps-game-load-25-rd-box/