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Yeah, well I had a blond moment and forgot about you elk So, if you saw copper streaks, I'm assuming that it would be safe to say that the copper wasn't completely and throughly removed. It does affect accuracy, just depends on one's definition of "greatly".
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Traces of copper can appear after only a couple of shots in some barrels, in other barrels, you may not see any after a dozen shots or more. I have seen traces of copper when cleaning a barrel immediately after shooting sub 3/8 moa five shoot groups, so in those cases, it obviously wasn't much of a factor. In some cases(not my rifles), the fouling was so extreme that groups shrank from over 2 moa to less than moa after the copper was removed.