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Mk. III rifles have conventional right hand square threads, so it would be possible for barrels to be set back and rechambered.
The unusual barrel threads on Mk. II rifles (apart from II**) would...

Look at the left side of the barrel breech. Is there a serial number stamped with small numerals? Factory sporting 1905 barrels will be so marked. Factory sporting barrels do not have a military...

I think you have a sported II***.