The 162s in both guns were a good foot higher than the 180s were.
So there is no question that velocity trumps a higher BC at least to some point.
And the point also is, after a certain distance with any cartridge, there is no point to a heavier higher BC bullet.
Move on to a larger case holding more powder if you want more performance.
Did you check for POI differences at your zero distance? That will certain affect any POI difference at extended distance. Regardless, difference in drop is not really the point of choosing a high-BC bullet. How did they compare in wind drift?
Your comment about velocity trumping BC depends entirely on the difference in muzzle velocity and the difference in BC, as well as the distance at which they are compared.
Your final point is actually the opposite of the truth. BC advantages become more and more evident as distance increases.
