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if it does not shoot close to moa after this then consider taking it back to the shop, given this is a brand new rifle. Don't futz around with it too much or they may start getting narky about...

+1 for Cu fouling. That shot of the muzzle indicates heavy fouling, and most likely a carbon build up too. Both will destroy accuracy. Given this is a new rifle and barrel did you go thru a break in...