Another comparable "hot-load" .22lr are the Aguila Super Maximum 30-gr. HP which are also very reliable for cycling semi-action pistols.
Not in my Walther P22. They were 100% unreliable. No exageration, not a single round fully functionrd tye slide...
That's quite interesting in that it's a hotter load than the Stinger which would seem to lead one to believe that it would operate a semi's action even more reliably...? I know that's the case with all of mine as well as my range buddies via SIG 1911-22's, SR22's and M&P pistols as well (granted no Walther's though).