Surely something similar has happened to somebody on here before.
The bores of my new Encore and new Black Diamond were clean but very rough. There were long gouges and circular rings on the lands. i scope and sight in a lot of rifles for other folks. Have seen this on 6-8 other TC rifles, mostly Encores.
My son is a machinist. He says the tool marks are the result of not properly polishing the bore.
My Encore had a whole host of other problems as well. After a lot of work and some expense the gun is very accurate. But theres a bad taste in my mouth every time i look at it.