I am building a rifle and am unsure if it will work as imagined. I don't want to spend a bunch of money on a barrel if I don't have to. I am looking to find a contoured blank. Green Mountain is the obvious choice, but they don't contour to the public, Midway USA has threaded and contoured Green Mountain barrels but don't have the twist I need. Is there a barrel maker out there that has affordable contoured blanks? I am looking for 30 caliber 7 or 8 twist. Thank you for looking!