I have just worked out the details for a 30-303 British barrel for an Encore. This is a 303 British chamber, but the barrel is 308 diameter. I was concerned about the throat and some of the measurements when using a the 303 reamer. I was told by MGM that they have done this with great success. Since I have nothing better to do with my kid's inheritance, I sent in the order.
It will be fun to see how well (or poorly) my bolt loads work from this!