I just recrowned and cut back a 1945 barrel that had a little bit of damage to the muzzle and it was almost embarrassingly easy with the Brownells hand tool. I've heard that 3000 - 4000 rounds is about the limit for most M1 barrels, and yet I hear stories about Remington 700 barrels that last twice that long....or more. Or is this just interwebs BS?