Since it is a new rifle, it probably is just a slightly rough bore. Thus, Paw Paw's suggestion is likely the right one.
However, to expand further.....
It is possible (NOT probable) that the muzzle area of the barrel is over sized, due to a manufacturing defect. Since the rifle is new, this would not be due to bad cleaning practice (cleaning from the muzzle end and contacting the rifling with a metal rod). Excess metal fouling is a specific region of a barrel can be indicative of the bullet "skidding" against the rifling. This would tend to happen, if the muzzle portion of the barrel is over the specified diameter....or the rifling in that portion of the barrel is damaged in some way.
The only way to know for sure is to slug the barrel. If the slug, when pushed into the area in question, suddenly moves along with much less resistance, then that portion of the barrel is likely over sized.
Now, having said all of that - let me emphasize - this is NOT probable with your rifle....and it is TOO early to tell. So, DON'T get into a twist over this possibility. It is MUCH more likely that this is a phenomenon related to the newness of the barrel.....and slightly rough rifling, as Paw Paw suggested. So, as he said, clean out the copper fouling, then shoot the rifle to "break in" the barrel. After you have at least 100 rounds through it, or sometimes many more, the tiny imperfections will begin to smooth out....and accuracy should improve. The fouling issue you mentioned will probably go away.
Even if it doesn't, the important issue is how accurate is the barrel. If the barrel is accurate, then there is nothing to fix. No two barrels are ever exactly the same....and some exhibit odd quirks, due to microscopic variances. As long as the barrel is accurate, it is nothing to worry about.