As to how well a boresnake cleans, there is good news and bad news.
The bad news is it does not leave a barrel completely clean.
The good news is that a barrel does not have to be completely clean to shoot well.

It is still a good idea to use a copper solvent periodically as needed to insure the copper does not build up from jacket deposits. If you're not sure there is copper, put some copper solvent in the barrel and let it sit a few minutes. That green stuff you wipe out is from copper deposits. A copper fouled barrel looks clean, just a little dull.

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Science plus Art