Much of the rifle ammo is/was produced in the US, using the Korean drawn brass,in a plant outside of Las Vegas, Nevada. I was there in 2004 to evaluate some loading machinery and got to stroll down the production line. A remarkably small operation.
Don't knock the Korean origins of the brass. In 1985 there was a test done of randomly purchased un-primed brass and the quality/consistency was found to better Winchester, Federal, and Remington. The current offerings seem to be as good.~Muir