The dielectric is what break's in more so than the conductor's.The dielectric takes some time to break-into it's optimal electrical properties.That's why you can have have two identical cables with different dielectric's sound totally different.Audioquest uses batteries to keep their dielectric's constantly at peak performance,not the conductor's.
Why do cables need break-in?
I just had the experience of having newly introduced speaker cables (AudioQuest AQ-8 bi-wire) break in. When I put them in a few days ago they sounded thin, bright and lacking in bass. Now, after 4 days and 40 - 50 hours, they sound far better: relatively neutral frequency spectrum with much more bass weight. I'm delighted, of course, but I'd like to know why this happens. Will I experience the same scenario when I change interconnects?