You can't necessarily attribute different points of impact to velocity differences when other things are in play. You even said it yourself, something along the lines of different loads come out of the barrel in different ways.
True, but I think the
best explanation would be velocity change. As in, it was leaving the barrel sooner than other loads, and therefore happened to be leaving before the upswing(if you will excuse my crude term) of the barrel.
I believe it happens on the opposite side of the spectrum too though. As in, if you reached another velocity node that was on the same node as the other rounds your POI would be higher. But I'm next to positive its all on barrel timing.
What will be interesting to see is how it reacts at longer ranges. I'm sure people have done studies of this, but I have no clue how to search for something like that on the internet.
