Please don't make experiments on your guns. The worst it could happen is to blow them up, if a shooter you would be lucky just blowing it up. Old and collectible guns weren't made with new steels so not only your gun would be in danger but your hands.
I knew a shooter that was proud to fire 9x19 in his pretty Astra 400, designed for 9mm Largo, much more powerful than 9x19. He blew it up and had several injuries not only in his hand.
If you can't find the proper ammo please learn how to reload it, everything is reloadable.
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