Some of the best barrel makers are all from Minnesota.
Krieger, Bartlein, Brux, Badger, Obermeyer, and Broughton are all in Wisconsin! Granted, a lot of east and west coasters don't know the difference between Minnesota, Michigan, Wisconsin or anywhere else they consider "fly-over country", but I work 5 miles from Krieger and Bartlein and I know they are in Wisconsin.
I have great shooting barrels from Krieger, Obermeyer, and Brux. I would also recommend Bartlein as they are ex-Krieger guys I know are doing great work.