Greetings, I would not rechamber, just size your cases to fit the chamber. Should not make any significant difference to your loads. The first thing would be to measure the barrel twist to see what projectiles should shoot in it. It may be a slow twist which would limit you to the lighter projectiles. Please get someone to mentor you with your load development. There is data out there but how safe it is is anybody's guess.
Regards Grandpamac.
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