Not quite what you asked for, but I have featherweight contour 10 twist .257 barrels from Green Mountain. I put one on a montana short action and put it in a featherweight model 70 stock. Had to open up the chamber area of the stock slightly, and most of the rest had only a few thousandths to scrape off, other than cutting it octagon. Made a nice rifle, and shoots under an inch 5 shots at 100. I sell the blanks for $235 + $15 postage = $250 shipped. 31 inches, cro moly.