I read the related post by "boltaction" dated 3-01-2013;
"A lot of the Mk II3* and some of the 5* had their chambers reamed out to deal with the issue of the differences between .303 British and .303 Ross, so the rifles do horrible things to the brass when you shoot them, but a lot of guys still shoot them. If the bolt functions well, the chamber and bore are in good condition, and the gun checks out, you should be fine to go."
I guess this would be an answer to the question. Cheers, Bruce.