Quote Originally Posted by Surpmil View Post
Strange that a prize rifle from 1908 would be reamed out like that, unless an owner had it done, perhaps on hearing all the jazz about jams etc.
Ross rifles do not have good primary extraction. As I understand it, the Mk II/1905 chambers were not reamed out. They were chambered with loose tolerances when built in order to aid primary extraction. The Mk II** are a different story. They are chambered to a tight tolerance. The Mk IIIs are the rifles that had their chambers enlarged as an after-thought.