You, can bore to a .338 Federal and JES will do it for you as well. But with two .338-06 rifles in my safe already I have no desire for a .338 Fed. I already have a .358 Win barrel, Stevens 200 action, SSS Competition trigger and recoil lug, sitting in my safe waiting to be put together. Just trying to decide on the stock I want, and I'm looking for a SSS tactical bolt handle to complete the project.