Not bloodly likely
I have a pretty accurate SKS (-M) with a scope...I say pretty accurate based on what others have said they get from their guns. Now, on a bench, and shooting slowly, I can manage about 1.25-1.5 MOA, with good ammo. So putting them into a a fist sized hole at 400 yards is pretty implausible. But to put 8 rounds in, he'd have be shooting pretty fast, and there's no way with ANY of my SKSs I could fire, re-aquire the target, shoot and repeat, and place all the bullets into such a small area (or even a much larger one for that matter!)