CeeZee,
I sure would like to see all those imported Ruritanian break action .22 rifles that had hinge pins (normally of a diameter similar to the barrel as RWD pointed out) worn away by the massive forces applied by the brutal .22lr cartridge. It would be extremely interesting to see how they manufactured the chocolate-tin alloy that they must be made of.
Certainly those made in Gardener MA, Springfield MA, Meriden CT and elsewhere in this country were made out of iron and steel. I simply do not believe and call "shenanigans" on your claim that the .22lr cartridge is able to wear out the hinge pins on those tens of thousands of single shot break action rifles that so many of us got third and fourth hand as our first rifle. And if you are suggesting that you could wear the hinge pin out on a .22lr Baikal break action, well, we're now in a land so fictitious as to merit no further discussion on that topic.
Another thought comes to mind though. A falling block type action might split the difference between these masses of extremely robust .22lr bolt rifles that you speak of and the lowly single shot break action.