Rechamber? Easy. Reboring? Once frequently done, now pretty hard to find and expensive. For the machine time, much more feasible to rebarrel and cut a new chamber. It was a much more feasible option in days gone by when labour was the cheaper part of the equation.
Is he sure he would like to do that to his 25-06 No.1? Might consider leaving it as is and buy a 9.3x62 No.1 instead. I would be hesitant to alter (adulterate?) any No.1 rifle.
Thanks, I will google the names. Do you have any contact info for them. You cam PM me if you don't want to post it.(double gun)
RKS enterprises
Ron K Smith
Wimborne, Alberta
Phone number is 780-631-2405
www.jccustombarrels.com
www.facebook.com/jurycustombarrels/