Ugly marks from button rifling are just about what one expects in a lot of factory Savage barrels. They generally aren't a lot of trouble. I have owned a lot of them, and they all shoot fine. Most of them shoot a lot better than fine.
The ejector bevel isn't unusual either.
It never hurts to do a little polishing and cleaning to smooth things up.
Your barrel break in method works about as well as any other method. But there are folks who have religious fervor about breaking in barrels. For what it's worth, I never use wire brushes. Nylon only. I typically use something like Butch's Bore Shine or the Outers Foam product. Let it sit and then follow with patches until the patches come out clean. Sometimes I get a bit OCD about these things.
Your rifle should do really well and make you happy for a long time.
Good luck with your rifle and welcome to the brotherhood of the barrel nut.
JS
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