1. Can't buy a barrel from Savage. Only way they'll sell you a barrel would be if you sent in your rifle and they installed it so they could proof test if before returning the gun. Even then, with how busy they are now, they probably wouldn't even want to do that unless it was under warranty.
2. There's no such thing as a long shank on a Savage. It's large or small shank, referring to the diameter of the threads. See this FAQ for a pic and more details on the differences.
http://www.savageshooters.com/conten...el-Shank-Sizes
3. Does the gun shoot good? If so don't worry about the small mark in the barrel. How it shoots is what matters, not how it looks.
4. Regarding the copper fouling, my guess is that the new jag or brush you got just offers a tighter fit and thus is doing a better job of cleaning than your old one. Hoppe's #9 isn't really designed for cutting copper, it's more a generic "do-all" general purpose bore cleaner. As such you might want to try something specifically designed for copper like Hoppe's #9 Benchrest Copper, Montana X-Treme Copper Killer, Sweet's, or Shooters Choice Copper.
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