That's about what I would expect to see. Imagine now if with each "reload" in the chain of fire, this is what's being pushed down the bore... IMHO, there's probably a good arguement for controling the fouling in the bore from shot to shot.
So, with the above said; should one fire a "fouling" shot before the first "Record" shot, to keep the bore in the same condition / shot to shot - for all Record Shot Score's? Probably... I could see that it could lead to tighter groups.
Will I ever do it? Highly unlikely, but again - I do see the merrits of it.