I don't understand whether this gun is a new gun, or used but new to you, or owned by you for a long time but recently sent out for repair. I think the phrase "got my 460 XVR back" is throwing me. I can't reconcile that with the questions you pose in the last part of your post.
If this is supposed to be a new gun I would not expect to see copper fouling in the barrel, and I would discuss the question with the person who sold it as new.
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David Wilson
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