Hoppe's is fine for a general bore cleaner. If you need it to handle copper then you need to allow the #9 to soak in the bore for a good hour as the chemical is much milder than some other brands.
Personally I like to use Birchwood Casey's "Bore Scrubber" which is a little stronger than Hoppe's.
Mail Clerk
Personally I like to use Birchwood Casey's "Bore Scrubber" which is a little stronger than Hoppe's.
Mail Clerk

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