Since your 22 small magazine has no markings it is not from Winchester. I have not noticed a 22 shorter magazine which was not precisely the same outside dimension as 22lr mag. I am able to’t envision how a mag, such as you described, could risk be safe when inserted. https://highimpactrounds.com/product/winchester-aa-12-ga-2-75in-1-1-8-oz-8-lead-1145-fps-25-rd-box/