Okay, now I see (said the blind man!)
I think we're all mostly on the same page here. People tend to hear "melting" and think of wax like melting. Just ain't so. Call it planishing, galling, impact sticking- it's all the same.
As to the GC itself- I think it does work as a scraper in tight enough bores. But I also shoot an 8mm GC in a .333+ bore with zero leading. So I also think at times it functions differently.