this is the same bullet design like the .25 caliber Diana ( btw, comming from argentina

) can on my last pic. its an impressive selection of caliber and weight there. Haendler & Natermann making them in europe but iirc only .22 and 25 caliber. the .25 slugs are like made orignal for the little 25 ACP, maybe useful for the 297/250 rook or light loads in the 25-20. other slugs may fit other small obsolete cartridges. of course, they say not for firearms but this are hollow points with a dish base that will stand light loads any time. because of the pure lead you can also increase the diameter by pressing the slug a little bit.

its true, the pellet design is very sensitive but I am sure something will be possible