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Try some Boretech Foaming bore cleaner that turns blue with copper. Give it about 15 minutes instead of the recommended 30 for the first try. Rather than cleaning it out, spray more in to "chase" the first batch out. It will be nearly purple if there's a lot of copper in there. Yours wouldn't be the first .22-250 that was full of copper.
Finish with KG12 just to make sure, if you have any, and your preferred normal cleaning practices.
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Nobody plans to screw up their lives...
...they just don't plan not to.
-Andy Stanley
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