My question is, How much is enough? I always start out with Hoppes #9,mixed with a little Kroil oil to remove powder and primer fouling. Once I'm satisfied, I then switch to Bore Tech's Eliminator, and work on the copper fouling. If it's been a long day at the range,I may use something stronger, like Sweets 7.62 or Shooter's Choice Copper Remover only a couple of times, always being careful to follow their directions and not let it remain in the barrel. Then I finish up the final cleaning with Bore Tech or Hoppes until I get a clean patch. I then run a wet patch through the barrel and put the gun away. Later, prior to shooting, when I run a clean dry patch through the barrel,there will be a bit of color indicating additional copper has been removed.I suspect this is from the small cracks and fissures in the barrel's metal. Does removing this last bit of "hidden copper" cause the barrel to go back to sort of a pre-seasoning condition? And, does this affect the accuracy or ballistics until after a couple rounds are fired, which again fills up those microscopic areas? At what point is the barrel "clean"?