I agree with Briman. What your paying for when you buy a Krieger or such is the qualtiy control in the machining process. The rougher the throat and the rifling the more the barrel will foul. I have been fortunate on lower end factory rifles like a 700 ADL and savages that have not fouled very bad at all. That being said I also do not shoot cheap bullets, I handload Noslers, Hornady's and Sierra's. I don't load bulk Winchester or Remington bullets anymore, they always seemed to leave the bore dirtier than the others.