Anybody that can run a barrel to the fourth decimal place is beyond good enough. Many outside of the manufacturing world do not understand exactly how impressive it is to have a barrel cut to the fourth decimal place when a human hair is ONLY three decimal places. Bad barrels happen. But those that understand the process realize you're 10 times as likely to screw up putting the a **** near perfect barrel on a morbidly out of spec action, screw up a bed job, or ream a poorly concentric chamber than you are to get a bad barrel from any of the top 5 to 10 barrel manufacturers.
Krieger, Hart, Shillen, proof, benchmark, Brux, lilja, Bartlein you name it. The name on the barrel is meaningless if you have someone booger up the rest. It's a component not a stand alone item.