You don't specify barrel contour, but since you are going to throw money at this project anyway...it's not much more machine time to set the shoulder back until the chamber cleans up. The .22-250 AI is kinda old skool, which may mean it's old enough that it was built with American 4150-4140-4130 steel of the finest quality which, in one man's opinion, makes it a great candidate for re-bore. I am not, as you can see a huge fan of the stampede to stainless like 416R ..particularly the last 25 years or so of import steel, with repeated tales and pictures (affordable borescopes) of pits, inclusions, hard spots and soft spots. Now, let the howling begin, yes I know David Tubb wouldn't use anything but stainless...but I also suspect that Tubb's barrelmaker takes every precaution to assure the finest materials on earth are used (since the barrelmaker will sell a thousand barrels because 'it's what Tubb uses'). You may not get what Tubb gets.