Don't be fooled or mislead by some country's war time expedient chambering practices. When things are desparate, you can take chances with SOMEONE ELSES's face, eyes, and fingers.
Some advice from a guy who lost a lot of blood and has over 12" of scars on his face-any rifle old enough to have the original chambering you noted should probably not be fired at all let alone be rebarrelled/rechambered. The rifle that almost killed me was a model reputed to be"one of the strongest" but had a slight flaw which ended in a catastrophic failure.
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