Theoretically the 303 may be quite easy with the correct bolt head to swap over.
The little screw on piece with the extractor.
The mauser not so much. You might be lucky to not have to do anything.
You might be somewhere in thr middle needing a chamber reputation slightly if too tight, or really unlucky to have to have the barrel machined a little to set it back with a possible reputation of the chamber for good measure
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