What about a second set of barrels in 9.3x74r or possibly .375 fl ? I am just thinking outloud here , certainly I am far from an expert in these matters , but new barrels could be made that wouild easily handle the pressure if the action would , it might be an option .

Lovely rifle by the way . I wouldnt change the barrels you have . One question though , what would you shoot with the 74 that you wont shoot with the 72 ?