You're going to have to get the copper out of the bore first, before you try the Tubb's system. If not, you won't do any good with the Tubb's bullets at all. That Tubb's bullet needs to ride down a clean, bare steel barrel to do it's polishing. As it sits now, it's just going to ride down a layer of copper.
If
3 foam sessions didn't get all the copper out, that barrel is
really bad
I have also used a chamber plug, stood the rifle up vertically, and literally filled the barrel full of Butch's and left it that way for an hour. You may try that too.
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