I've done this and it works as long as there is not too much lead fouling in the barrel, in which case, you will have an overpressured round. Not ideal in a Luger.
A friend of mine blew up an M16 by extensively firing lead .22 rimfire through it full auto with a conversion unit then swapping back to .223 without scrubbing out the barrel. After I saw that, I built a dedicated .22 rimfire upper for my M16 and use that, and only that, with .22 rimfire.
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