Btw, I wanted to throw out some random speculation...
If we think that barrel induced spin is a cause of inaccuracy, do you think this could be the reason that I saw an INCREASE in accuracy in paint that was slightly oblong in my test? I'm thinking if the paint "found a home" in the barrel with the minor axis perpendicular to the barrel, the underbore could have prevented it from spinning in the barrel.
yeah, that is my thoughts as well.
but as an increase in useable accuracy, i don't think we have seen that in any testing.
At 30 feet I was able to observe significant correlation between the accuracy of a paintball and it's off axis diameter... so, I've seen that in testing (and with poor-mid grade paint ). I have no reason to believe that this effect will be anything but more pronounced at longer ranges.