Well like I said, since I learned that the Hoppes is suppose to be bad for Nickel I have stopped using it - probably 10 or so years ago, but when I did use it, I used the #9 standard NOT the Copper Remover with the black label.
Surprisingly enough, NEVER had a problem with the stuff on Nickel.
Now I use RIG #2 Oil. GREAT STUFF!!!!!
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